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Charles Davis

Pelagic Thresher Sharks

The Pelagic Thresher shark (Alopias pelagicus) is the smallest of three species of Thresher sharks, the Common Thresher and the Big Eye Thresher being the other two, all are listed as vulnerable on the INUC Red List. While the number of Thresher sharks are on the decline they still are a common species of shark to be caught by commercial fisherman and in many places are still sought after as a game fish. They are seldom seen by divers however. The three species are all technically pelagic, in that they generally live in deep water. The Common and the Big Eye are known to visit shallow areas to feed and will at times stay for a while before dipping back into the deep waters. Threshers will also breach, a trait common with dolphins and whales but not common with sharks.  Generally they have no pattern to when they visit shallow waters, also Threshers are loners. They seldom travel with another of their species and are shy around divers. These are some of the reasons that Threshers are not as common a sight to divers.

The Pelagic Thresher lives in warm tropical waters and are migratory. They can be found in the tropical and semi-tropical waters of the Pacific and Indian Oceans including the Red Sea. Not as much is known about them as the other two species. The Pelagic Thresher seems to be the one that values its privacy the most. Individual sharks separate themselves from others with both horizontal and vertical distances. They seem to keep themselves at depths between 60 and 250 meters. While they are believed to be highly migratory, there has been no studies to conclude the range of individual sharks. Unlike other marine animals threshers migrate individually not in pods.


Carla Gomez

I love Thresher Sharks, they are so cute with their big eyes! Ive seen one in the distance in Egypt, but not been lucky enough to get close to one.

Charles Davis

I was on the internet the other day searching for some information on dive watches and came up with a number of interesting comments on the web. Some of them made me wonder if I was really out of touch with diving, or do I just have a different viewpoint of “most” divers. My first shock was learning that I never owned a “serious” dive watch. A leading dive magazine had an article which included this quote, “a serious dive watch must be able to withstand 20 atm of pressure”. My first dive watch was a Citizen Hyper Aqualand that include a depth gauge and allowed the dive profile to be exported to my PC, but it was only rated for 100 meters or only 10 atm. I was very happy with the watch and never had any problems with it not being a “serious” dive watch.  For myself, I am happy diving at less than 4atm, so the 20 atm of pressure threshold is not that important to me.  Later in the article under a title of “For The Deep Diver”, they discussed a watch rated at 1,000 meters. To their credit they did mention that the diver would be crushed before the watch.

Another website told me what is the most popular watch for scuba divers and going to that company's website learned that the watch is “At home in the oceans, where it remains an indispensable instrument for every diver”  the watch being described is the $8,000 Rolex Oyster Perpetual Submariner. While a model of the submariner was available when I purchased my Aqualand, I never gave it any consideration. Another website had an article for the “5 Best Diving Watches”, the lowest price one was more expensive that the last new car I purchased and the most expensive was in the range of my house.

Abigail Booth

Abigail Booth

Ive only every used one computer which was my first ever one, a Suunto Gekko. Had it 6/7 years now and no problem. I dont need anything fancy, it does whats necessary and my wrists are small so never going to wear one as a watch in everyday life.

Bonnie Waycott

What could be better than to walk into the sea early in the morning with your dive gear and a picturesque view of Mount Fuji?  At Osezaki on the northwest tip of the Izu Peninsula south of Tokyo, this is exactly what you'll get if the weather is good.  Small and protected, this little bay is where divers from Tokyo go to get certified, get further training, or simply dive for fun.  It faces out into Suruga Bay, one of the deepest bays in Japan at around 2,500m with around 1,000 kinds of fish.  The view of Mount Fuji makes Osezaki Bay quite possibly the most scenic dive location in Japan. 

Crowded with divers in the summer, the bay is wide with several dive shops, restaurants and inns lining the big sandy beach.  It's also very sheltered and the sea is calm, which makes it ideal for training and a chance to put various skills into practice.  After signing in and arranging their dives with one of the many dive shops, divers pick a spot on the beach, lay out some picnic sheets and set up their equipment before walking into the water.  Once in, the underwater scenery begins with a stone grey pebbly and rocky bottom at the shoreline.  When visibility is good, this part is not to be dismissed because even at 2-3m of water you can see up close the seaweed sticking to the rocks and an array of fish darting about below.  The next feature is a pile of big rocks and concrete boulders, followed by a slight drop into sand, mud and muck to around 8m. From then on the bottom becomes sandy, muddy and mucky, spreading out towards the deeper depths.  With no more drop offs, divers are free to swim out into the unknown.  There's usually very little current, so diving conditions are normally not the least bit challenging but when it's crowded with divers stirring up the bottom or gathering around to photograph the next nudibranch, visibility can get pretty poor.

Charles Davis

Like The Superhero's Sidekick- The Value Of A Wetsuit Is Often Overlooked

The wetsuit is often the first piece of dive equipment many divers purchases after they have their own  mask and fins. It is also very likely the least researched and understood purchase a new diver will make. While he will spend hours and hours researching on the internet and asking other divers about their BCD's and Regulators, when it comes the wetsuit it is likely just asking the instructor how thick should I get. The wetsuit helps your diving with three important functions: Thermal protection, Buoyancy and protection from scrape and cuts. In my view, the wetsuit is the most individualized item in your kit. Double that for the ladies as in many cases the style element is more important to them. While any wet suit that is a proper fit and appropriate for the water temperatures will do, a little research and clear thinking will get you a suit that is the best wetsuit for your diving. I have broken out a few points to consider.


Wetsuits are made out of neoprene and the thickness determines the thermal properties. Neoprene is a rubber material injected with nitrogen during the manufacturing process. Back when I bought my first wetsuit 17 years ago, not only was that a true statement it was the entire statement. While still true it is a little more complicated. Wetsuit today are made from neoprene that in many cases have had other materials included in the manufacturing process. Spandex or similar material is often added to the neoprene to allow it to stretch and concur to your body better. These suits are generally easier to get on and off. While being worn they hug the body closer eliminating air pockets. The major manufacturers are all using this material. I would be cautious of getting a suit using standard neoprene as the new materials  are better suited for diving. Similarly related, get a suit that is designed for scuba diving. The grade of neoprene used in wetsuits for are sports are not able to withstand the pressure encounter while diving.

Bonnie Waycott

In early June, hoards of divers and non-divers arrive for an annual clean-up project aimed at removing debris and litter from the lake bottom and surrounding areas.  The lake is around 900 meters in altitude and goes down to a depth of around 138m.  Following a Mount Fuji eruption in the 9th century, a large prehistoric lake separated into three smaller ones that are still connected with each other by underground waterways.  LakeMotosuko is one of the three.

Before the clean up, divers can pick up a map from the organizers, which marks out areas with the most litter.  Once separated into pairs, they are then free to choose where they want to go and head right in.  The lake is caked in thick sediment (ash and silt) so stable buoyancy is crucial.  Kicking hard will stir up the sediment and worsen visibility, making things difficult not just for yourself but also for your buddy and in the worst case you can lose each other altogether.  Each buddy pair also has a mesh bag to put the litter into so the diver with the bag must remain suitably buoyant as his or her load becomes heavier.  

Upon descent, the underwater scenery begins with a slope of sediment and volcanic rocks, strewn with items like fish hooks, fishing lines, beer cans, plastic containers, hair ties and small boxes that once contained takeaway meals.  Usually the clean up is conducted at a maximum depth of around 9-10 metres.   A lot of debris is simply dumped into Lake Motosuko due to the camp sites, excursion boats and windsurfing facilities that are close by, while pollution from various water activities has made the lake cloudy so despite swimming carefully, visibility is not altogether great.  However, there is some life to be spotted such as weed-like plants and some large grey fish that are probably a type of trout, as rainbow and brown trout are known to inhabit the lake in addition to shrimp and other smaller fish.  At 16 degrees the water is cold.  Wearing a dry suit is the best option by far but it’s possible to cope in a 5-7mm wetsuit and a 3mm hood and vest underneath.  A hood and gloves are also essential.  Due to the altitude and low temperature, 30 minutes is the recommended time to stay underwater.

2012.10.17.Taveuni Fiji..76

Timur Kholodenko

Very nice article, thank you.


Mike Bednarz

I agree great article. Ive done some underwater cleanups, its great to help!

Bonnie Waycott

Thanks guys, it's a great way to dive, helping out and having fun :)

Charles Davis

If you were to make a list of what you paid for the different items in your diving kit by price, the wetsuit would be far down on the list. Still it is a fairly decent amount, and most divers find that it is the first thing that they have to replace. Wetsuits generally need to be replaced because of three reasons: The suit loses it thermal and buoyancy properties, it sustains physical damage due to snags or rips,or the wetsuit shrinks around the stomach area due to too many after dive beers.

The second and third reason there is not much advice we can give, but there are a number of items we can do to prolong the life of a wet suit to keep it from losing its thermal and buoyancy properties.  Neoprene is the material most wetsuits are made of. It is a foam like synthetic rubber material that has had nitrogen injected into it during the manufacturing process. It often has a cloth backing for support. The trapped gas bubbles provides the buoyancy and thermal properties that the wetsuit is noted for. Over time these gas bubbles will “pop” escaping from the foam, as they do so the buoyancy and thermal abilities lessen. Certain actions increases the process while others will minimize the effects.

Tips For A Long Life Wetsuit

  ▪  When purchasing your first wetsuit insure you get one made for diving, looks can be deceiving. A wetsuit made for surfers may look very similar, however, it will have considerable more gas in the neoprene. This will help the surfer stay warmer per each mm of material and have greater buoyancy. The more gas in the suit will make it more fragile and under pressure will very quickly breakdown. A suit designed for swimmers has even more gas and may not even last through your open water training.

  ▪  Shower after each use. Salt from the water as well as salt from your skin and body oils will speed up the natural process of the neoprene breaking down. The easiest way to help eliminate the salt is wear your suit in the shower. Your wetsuit doe not like hot water.  While an after dive hot shower may feel great your first shower should at best be warm for circulation reasons. So wear your suit when you start your shower and get some of the salt off it as you get the salt out of your hair. The shampoo is okay for your suit. If you are finish diving for the day, then remove the suit, turn it inside out, rinse and place in a tub of clean water. Let it soak for thirty minutes, plenty of time for you to finish your shower and dry off.


David Lundberg

Some great tips, and some that beginnings may not know. I look after my wetsuits and in 20 years have only had three, its worth putting in the extra time and care.

Charles Davis

Thanks for the comments David.

Latest from the dive community

Rating 10/10


This is one of the ships that have been wrecked in Santa Maria bay. Santo Antão was a cargo ship 14 crew, built in 1957 in Lisbon. The ship had a length of 53.30 m (with maximum beam of 9.02 m, Draught 3.35 m at the bow and stern Draught 3.63m). Santo Antão was carrying goods between the various islands in the Cap Verde Archipelago. Sunk during a storm to hit a reef near the shore of the island of Sal in 8 January 1966. A short, 8 minutes boat ride from Riu Hotel bay with Scuba Caribe Diving Center. The dive with depths ranging 7 to 11metres, visibility is between 8 and 30 metres. For lovers photography, the extraordinary diversity of fauna, a sanctuary of porcupine fishes is truly impressive and makes this a mandatory dive.

Screen shot 2010 04 21 at 6.52.24 PM2 santo anta copy IMG7149 copy 1015378510202569867466754586023135063940387n

Gabriel Onus

Porcupine fish are very cute! Looks a nice site.

miroslav photo 1

Miroslav Karaicic

Excellent, finally we have some more info about our nice shallow wreck. :)


Nick T. Morrison

Looks like a good dive site and shallow too, so great light for photography and beginner divers.

Rating 7/10

Playa del Carmen, Mexico

Playa del Carmen11 Jun 2014 - 25 Jun 2014

This is the third of my trilogy. Of the three, this was the least memorable. To start with there is no jetty so the boat comes into the beach and you have to wade into the surf to about chest height with a mesh bag with your kit in and climb into the boat. This side of the channel (see my Cozumel report) the sea bed is at only about 12 m so good visibility and long dives (even I could last 55 minutes!). Primarily this is drift diving although one was a mix of coral reefs and drift. There is good fish life, primarily large shoals of grunts and snapper which will let you get very close indeed - to less that a metre. There are plenty of large moray eels of various species and we saw one eagle ray although that was rare for this time of year. There is also a large number of yellow rays (which look brown under water)which I think are limited to this location and that occasional large grey ones. We dived with Yucatek Divers, a Swiss owned operation, who can also organise cenotes diving (see my Tulum report and photo hopefully attached with me upside down) and would happily recommend them as they can also do you a deal with hotels if you dive with them. This is the most commercial part of the area and whilst there is almost limitless bars restaurants and shops, the salesmen that go with them aren't too bad but can get a bit tedious

Hana Nováková

:) I quite like a wade out.. makes you feel adventurous!


Julieta Rodrigues

I enjoy your reports. I hope to get back to Playa next year :)


Debra Johnson

Thanks for sharing sounds a fun dive spot we remember for the future. I really want to dive the Cenotes one day,

Rating 10/10

Thresher Cove Resort

Malapascua23 Jun 2014 - 27 Jun 2014

I visited Malapascua island, which is just off the far northern tip of Cebu Province in the Philippines. I stayed at Thresher Cove resort and the resort and diving was wonderful. The resort is new on the site of an old resort that had been abandoned. it sits in a small cove with a hill all around the resort. Nice white sand beach at high tide, at low tide the sea grass is uncovered. Mostly backpackers were there on my trip. the accommodations range from tents and dorms to a luxury villa. The dive center has all new equipment. They have two large dive boats and two small six paxs.

2014 06 24 10.20.45 2014 06 24 09.46.19 2014 06 25 09.40.06
Showing 3 of 5 comments. Show all

André Fernandes

Looks a beautiful place! Was this area affected by the typhoon at all?

Charles Davis

Hello Andre: sadly very much so. I spent some time walking around and you could still see areas that showed heavy damage. The resorts are open but some of them still have building that can not be used. Most of the dive centers have foreign owners or investors so it was easier for them to get rebuilt. The divers have not come back in large numbers yet. The dive sites are mostly unaffected. I asked to dive on the most heavily damaged site and while you could see areas that were damaged it seem to affect only about 25% of the reef. Other sites I did not see any damage to the reefs. What depressed me the most was the town of Maya which is on Cebu and is the location of the ferry to the island. Still many building destroyed. School year starts early June here and many classrooms have not been repaired. Most of the classes are being held in function tents. To your comment, yes it is very beautiful and the people very open and friendly


Sienna Mackenzie

Sad to hear that schools are not being rebuilt - but I guess it is a very poor country.. best things we can do is go there and support the local community (and enjoy the fine looking diving) :)

Rating 8/10

Cozumel Mexico

Cozumel11 Jun 2014 - 25 Jun 2014

Although this island is visible from the mainland, the diving here is very different and much better than Playa del Carmen and thereabouts . It is rightly considered one of the best diving locations in the world. There are dozens of dive sites on the leeward side of the island and apparently over 100 dive operators which means this is also one of the cheapest places to dive in the world (Roatan in Honduras is probably the cheapest place). It is mainly drift diving here along the legendary wall and very good it is too. Clear warm water (28 degrees) of that's your thing - it's certainly mine. However the best dive we did by far was Palanca Caves. This is a collection of huge corals and dramatic swim-throughs down to a depth of >30 metres. Google images and videos are worth a look. We dived with Scuba Gamma, a very friendly French owned operation who have a six man boat so none of the big groups you sometimes see there. They will pick you up and take you to the dock. Recommended. You can fly direct to Cancun from the UK and then a taxi or bus followed by a ferry or to Cozumel via the US. High season is December to May. June was fine though but quiet.

Gifford Pelletier

Good advice. Never been but it is an option for the end of the year.

diving goggles 1208672 m

Camelia Kemenes

Im planning my next holiday and would like to visit Mexico. I wont have much time so would you recommend Cozumel over Playa del Carmen? Or could i do both in 10 days?


Paul Foster

You can certainly do both in ten days Camelia. The ferries between the two run regularly (every hour I think) and it is a journey time of less than an hour. For ocean diving, Cozumel is by far the better option, but if you are interested in doing some cenotes diving then you should do that from Playa (or Tulum). Cozumel is quiet whereas Playa has a big restaurant and bar scene, so it's a choice depending on what you want out of your holiday.

Rating 9/10

Yucatan Peninsula

Tulum11 Jun 2014 - 25 Jun 2014 with Koox Diving

We have dived three cenotes as part of a dive trip in the Cozumel/Playa del Carmen area. Dos Ojos, Carwash and Gran Cenote.

This whole part of Mexico has this huge network of underground rivers called cenotes and a large number can be dived without needing a cave diving qualification. Although you can go from Playa del Carmen, Tulum is better because there is no ocean diving to speak of so all the dive operators in town specialise in cenote diving, and many of the good ones are only a few minutes drive away.

A quick look on Google images will give you a good idea of what to expect. Provided you are OK with confined spaces, although some of the caverns are huge and you have good buoyancy, I would recommend this to everyone. Even poor air-consumers are fine because the dives are relatively shallow (rarely more than 15 metres) and the water is still, the dives are really gentle. Strict rules apply to those that lead the dives, which are actually treated as cave dives in terms of redundant gear, even though they are not. For non cave divers you will always be able to see the surface even though it may be up to 60 metres away. Visibility, subject to the amount of available light is to all practical purposes, unlimited.

Because the dives are shallow there is little in the way of surface interval, so by the time you have driven from one cenote to the next and kitted up, you are ready to go again.

One other thing; because the water is so clean (it's effectively spring water that has filtered through the limestone) your kit will be cleaner at the end than at the beginning and will be ready-rinsed.

It is the wet season between August and November and it can be very wet apparently. We're here in June which is off season but that is all plusses for us, it's quite (we were the only divers with the guide today - they are allowed a maximum of four divers) yet apart from the occasional shower it's been continuous sun. But this is proper heat 38 degrees C.

Showing 3 of 6 comments. Show all

Aladino Trentino

Ah - best to be at the front I am guessing!


Paul Foster

Yes but as each leader is limited to four divers and the one we had was very safety conscious it's not hugely important


Sienna Mackenzie

This diving sounds really fun! The divers with 5 tanks.. that sort of cave diving just scares me!

Rating 10/10

Clean up Sal 2014

Beginning of June marked two important conservation days: 1. The World Environment Day and 2. The World Ocean Day. Numerous events have been organized around the world to raise awareness for our environment. The sad truth is that all this efforts don’t seem to be enough, as the problem is growing. One big issue is the ocean debris problem. Enormous chunks of garbage are floating in all our oceans collecting more and more debris via ocean currents, winds and continental sewage systems. Even if we would start today collecting and recycling all that amount of waste material, it would take years, even decades to clean the oceans. Unfortunately, the problem is not being addressed properly. One way of helping would be if every community, as small as it may be, would do its part in adequate garbage disposal and recycle use.

The Cape Verde Islands are not a main debris producer. Studies show that 400 000 kg of debris is left daily on all the Cape Verde Islands (Ferreira, SEBRAE, 2012), that is 0.8 kg per citizen. Of course, a huge part of this is tribute to the tourism industry, over 400 000 tourist arrivals have been counted already during 2012, and the number is growing ( Yet, Cape Verde does not have a working garbage recycle plant. Most of the debris is still burned or buried, that is how far environmental awareness is reaching us.

Scubacaribe and SOS Tortugas have made the effort and cleaned the beach and ocean during June. Dive sites Ponta Preta and Jardim, just in front of the Riu Funana hotel, have been attended. Our colleagues from the SOS Tortugas have done a great job on Serra Negra, the south eastern beach of Sal. Over 700 kg of debris have been collected there in one single day. And that is after the cleaning was done during May and April as well. The beach on the south western side Ponta Preta are much better maintained, thanks to the daily attendance of the hotel staff. Only 30 kg of debris was found there by our divers. That is good news!

07 debris 1 09 debris 3 10 debris 4 16 group photo
Showing 3 of 5 comments. Show all

Mike Bednarz

Nice work Miroslav & Scubacaribe team! Waste in the ocean is such a big problem and with a couple billion people though out the world increasing in wealth increasing their consumption (and consequently their refuse) it is hard to see how this is going to get better without broad international action on waste management and protection of the sea.


Rich Ward

Good stuff :)


Dawn Hadsell

Yeahhh! :) 700kg is a lot of junk!

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