Quote:
Originally Posted by Winnipesaukee Divers
I have found several of them fully intact but can't seem to get any of them to the surface before they explode due to the pressure change and air built up within the clay.
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Not that you asked, but a suggestion to facilitate recovery.
If you take a pressure cooking pot and install a real needle valve in place of the standard weight type...
Bring the pot down with the lid off.
Place the clay in the pot.
Put some of your air in the cover.
Put the cover on the pot with the valve closed.
Bring the pot to the surface where the air in the pot will remain at the same high pressure it was at when the cover was installed. For example, at 10 meters you would capture about 30psi in the pot.
Now the hard part, slowly release the air pressure over the course of a few days? Not sure how long it would take to safely relieve the internal pressure of the clay.