Question to all you Divers !!

[padi56]

Originally Posted by Goodwatch

The real divers will correct me if I’m wrong but I believe the following is the case. Helium atoms are so small that in a pressure chamber and above a certain pressure (= virtual depth) they are able to penetrate through either the o-rings or the crystal. This only happens in very high pressure circumstances where there is the need for a Helium-Oxygen mixture. Beyond the Sub’s capabilities. At 500 meters there is a pressure of 50 Bar and thus the Helium pressure inside the watch is also around 50 Bar. When in the decompression phase, I guess unscrewing the crown isn’t enough to release the pressure fast enough and the crystal will pop off. Hence the valve.

I must have been an 18 year old boy when I first read the “underwater habitat’ phrase about the Sea-Dweller. It took me 20 years to grasp the concept.

100% correct Frans and another reason why the SD dont have a cyclops.

[Goodwatch]

Originally Posted by gforce

When your in a submersible, do you still feel pressure going down that deep?

No, that's why it is a submersible. It retains the surface pressure of around 1 Bar.