Wednesday September 03 , 2014

A Easter Dive Trip for Everyone

A trip over Easter for everyone, from a Tec Diver to your Children.

Some destinations that we organise trip to are designed for the new diver, others for the experienced diver, some would be good for snorkelers as well and this one is designed for everyone. Over the easter period there will be a group of us heading over to Santo in Vanuatu to check out the wreck of the President Coolidge.

From tec to New divers
The wreck is unlike most wrecks perfectly situated as a shore dive with the top in 25m and the bottom in 70m so great for all divers. All dives are done in very small teams so if you are there to do a re breather dive you can or if you just want to stay on the outside and go no deeper that 30m you can do that. This is what makes this trip perfect for all levels.

President Coolidge Wreck

President Coolidge Wreck

Bring your non diving partner
The dives are done a single dives with a surface interval back at out hotel so you can bring you non diving partners and they will not be left all day by them self. The divers will be out for a few hours in the morning and the afternoon and well this is happening the non divers can enjoy the pool, read a book, or if they are adventurous can do some of the land tours like the blue holes, champagne beach or even the canyons.

Bring you kids
Carl and myself will be bringing our kids and sharing the dives so there will be one of us there during the day to look after our kids and yours. This works well as one of us can look after the diving side and one can look after the kids if you are not there. No we are not planning on taking this job on alone… we will also have local nannies to help us during the day and I find it works well to have them in the evening if we head out to dinner. Relax and enjoy your holiday while the kids are having fun as well.

Check out Easter Dive Trip  for details of out next trip over there and keep an eye out for more blogs on the Coolidge trip.

enjoin a dive trip with the kids.

You Should Join Us

 

The Silent World is Far From Silent

With the recent improvements in rebreather technology the opportunity now exists for recreational divers to enter “the Silent World” that Cousteau promised and to have true interactions with marine creatures without the noise of breathing scaring them off.

The interesting thing is that the underwater world is anything but silent. Once you get rid of the sounds of your bubbles you hear sounds of snapping, crunching, thumping, grunting, clicks, whistles, songs and more with the sounds emanating from animals that vary in size from fish to shrimps to whales.

It is estimated 300-500 species of fishes make some kind of sound, although many of the sounds are of such low frequency that the unaided human ear cannot detect them. Among other reasons, these sounds are used to deter predators, warn other members of their species of impending danger, and attract mates.

old wives

Swimming through a noisy School of Old Wives

The three main ways fishes produce sound is by stridulating; vibrating and via hydrodynamics.

Stridulation is the act of producing sound by rubbing together certain body parts. Fish rubs various body parts being used by different species. The sea catfish use spines on its pectoral fins to create a squeaking sound. Other fishes such as the pipefish and some seahorse produce sounds by rubbing together skeletal bones. Fishes also produce sound by rubbing or grinding their teeth. Old Wife fish around Sydney get their name from the chattering noise they make when they rub their teeth together.

Vibration create sound by many fish contracting muscles around their gas-filled swim bladders, an internal organ that functions both in buoyancy control and as a kind of echo chamber in sonic communication. Many fish vibrate their swim bladders to be an effort to ward off predators and warn other members of their species of imminent danger.

Hydrodynamic sound production in fishes results when an animal quickly changes velocity and/or direction. Hydrodynamic sounds are low-frequency and are not usually used in intraspecies communication. The sounds produced from a swimming fish are the result of the shape of the fish and the properties of water. As an object moves through water, the water around the object is compressed and moved, thus, creating sound. Just swim through the cave at South West Rocks and the lobsters give a great example of Hydrodynamic sound.

A humpback and her calf

A humpback communicating with her calf

I find the most exciting sounds under water to be the sounds of communicating between marine creatures. Communication through sound is very important in the lives of dolphins and whales. While diving my eXplorer at such places as the southern side of Bare Island or Cape Solander I often her migrating whales. .

Humpback whales are often called the singing whales, and their songs have been well studied in recent years. It is believed that only mature males sing, and that they do so to attract a mate. When singing, all of the whales position themselves near the surface with their bodies facing at a downward angle. Interestingly, the songs change over time, and it has long been known that all whales in a given area sing the same song and with each new year a slightly different version emerges at the top of the whale’s hit list.

Now I dive a rebreather I’d have to say that it is clear that the underwater world is a cacophony of natural sounds, and anything but “the Silent World” promised by Jacques Cousteau. Remember silence is golden.

Peter Letts

 

Silence is Golden

Giant Cuttlefish

Great interaction with cuttlefish in a silent world.

Divers who have done research into scuba diving have probably read about the silent, in fact Jacques Cousteau the father of open circuit scuba diving referred to in the “The Silent World” in his 1953. This is not completely accurate, breathing underwater is surprisingly noisy!

Once divers becomes accustomed to breathing underwater, they starts to tune out the bubbling sound of exhalation and the comforting whoosh of air as he inhales, but to the creatures that live under the water, the sounds are surprisingly loud!

Because sound travels far greater distances than light under water and water conducts sounds much more efficiently than air it is not surprising sound plays a more important part of marine creatures life. Underwater creatures rely on sound to acoustically sense their surroundings, communicate, locate food, navigation, reproduction and protect to themselves underwater.

My main reason to go scuba diving is to interact with marine creatures not to scare them off by sounding like a freight train.  Yet when I dive using an open circuit scuba regulator, seadragons turn their back on me and swim off, I can’t get within 10 meters of luderick, and cuttlefish show me their jet propulsion.

With the recent improvements in rebreather diving the opportunity now exists for divers to enter “the Silent World” that Cousteau promised and to have true interactions with marine creatures without the noise of breathing scaring them  off. With the development of the Recreational Hollis eXplorer Rebtreather a whole new world of diving is now available to recreational divers. A world where divers can silently enter and they don’t scare off marine creatures with the noise of breathing. Remember silence is golden.

Pesky Seadragons

Seadragons don’t swim away

Peter Letts

 

Vanuatua Christmas Dive Trip

The Hideaway Island Resort and Marine Sanctuary is situated in Mele Bay, a 20 minute ferry ride from Port Vila, the capital of Vanuatu. Surrounded by clear turquoise waters and coral reefs, it is one of the few places where you can hand feed hundreds of "tame" brilliantly coloured fish in a safe protected area. This is an experience you wont forget!

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