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Are there any nations where diving with a breathing set is tightly restricted, or allowed only for work and the armed forces? Are there many police or armed forces operations which result in bulk seizure of scuba gear? If so, what happens to it? If it is incinerated, what happens to...

Strapped-in mouthpieces have their uses. Once in Trearddur Bay with my Nemrod regulator strapped in, I let myself go completely limp to simulate unconsciousness, and while limp the buoyancy rolled me over to belly-up, and my cheeks distended, but my strapped-in mouthpiece stayed in place and...

What is the duck bill eliminator? I am familiar with the rubber duck's-beak-shaped valve on the end of the exhalent tube in the wet side of twin-hose regulators. In Nemrod's message's last image, looks like a lot of plastic. The old twin-hose regulators that I remember were largely made of good...

Back when 2-hose regs were common, I learned, when swimming with a 2-hose aqualung but not breathing from it (e.g. on the surface), to put the loop of breathing tubes under one arm to keep the mouthpiece deeper than the regulator, to avoid free-flowing. (Once when I surfaced with my breathing...

Look at this Youtube video "Double Hose Regulators: "Around the world in 11 minutes"" for lots of makes of twin-hose open-circuit scuba regulators. Who makes twin-hose open-circuit scuba regulators now? Here is a CGI image that I made.

It came to me that if the rebreather had two diluent cylinders, one for nitrogen and the other for helium, and a ppO2 meter and ppN2 meter and a ppHe meter, then it could keep the ppO2 to the most that did not cause oxygen poisoning, and keep the ppN2 to the most that did not cause nitrogen...

Closed-circuit automatic rebreather diving on nitrox is easily catered for, because ppO2 meters are readily available, and, knowing also the depth pressure, keeping the mixture correct is easy, as many of you know. But trimix (oxygen and nitrogen and helium) diving is a different matter, and...

I read many years ago in a scuba diving periodical that among the inhabitants along the south coast of Crete there was (at the time) a tradition of illegal scuba diving.That may be a part of a general tradition of rebelliousness and independence that has been endemic on Crete starting in the old...

i read about someone got concerned that wild dolphins would see and imitate and attack any divers.

Do these devices all merely surveill? Or can any of them catch a diver and bring him back to its base? In wartime, frogman-killing devices have been heard of, and I wonder if any such devices (e.g. high-powered ultrasound) are installed in secret important naval bases.

Crane barges etc., and the likely crew size and well armed :: sounds like that a armed police launch or small patrol boat sent against them, that could easily arrest 6 unauthorized weekend divers with sport scuba in an inflatable, would be in a similar position to a police dog barking at an...

Thanks. On WIkipedia, L3 links to L3 Technologies ( L3 Technologies - Wikipedia ) , which in 2018 became part oif L3Harris Technologies ( L3Harris Technologies - Wikipedia ). Hydroid links to Hydroid Inc., which redirects to Kongsberg Maritime (KM) ( Kongsberg Maritime - Wikipedia )...

Today's (Monday 19 July 2021)'s issue of the Daily Telegraph British newspaper has on its page 1 (Drones to patrol wartime sea graves) and page 8 (Underwater drones to protect Navy sea graves from bounty hunters) two items about plans to protect against illegal salvaging of war-grave wrecks. It...

A query about a point that has caused comment about my CGI scuba diving images: What proportion of scuba divers can equalize their ears without pinching their noses (either by hand or by a noseclip)? I can do it easily routinely, by pinching my nose by the action of 2 small muscles called...

Same with Ely Cathedral in England, after wood-rot was found in the bottom ends of the main long wooden beams in the central octagon :: oak tree trunks that long don't exist any more.

I read somewhere about conifer trees growing on a mountainside, at an angle away from the ground, then gradually turning to straight up, in a natural curve, handy to make a ship's rib from. I read that naval oak forests were grown with wide gaps between the trees, so the trees would grow with...

I read that in Britain in old-type wooden naval shipbuilding, a shipbuilder would go with the lumberjacks into the naval oak forest to find pieces of tree where the grain went naturally in a curve or a sharp angle, to use in shipbuilding. For example, if a big oak trunk is cut through just above...

Due to age I am now out of the active diving scene. In Britain, and across the world, how much has active sport diving (weekend and one-day diving, and diving holidays) been affected by the coronavirus public lockdown?, apart from what I know via the newspapers and the television news.

The link address Калипсо - в память о Жак-Ив Кусто - ЯПлакалъ is Russian for "Calypso - in memory of Jacques-Yves Cousteau - I cried". In reply to message: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Anthony Appleyard, АлександрД replied to a thread you are watching at...

Of the structures and fittings removed during this, which can be reused? See also: At the heart of Calypso , part 2 - Cousteau At the heart of Calypso , part 3 - Cousteau At the heart of Calypso, part 4. - Cousteau At the heart of Calypso, part 5 - Cousteau Calypso is under shelter - Cousteau...