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Boating All Out

In article 42a60c43-00c3-450a-9e7a-
,
says...

"neutral Buoyancy" simply means the same average density as water.
Putting the object under water will still allow it to release gas
which will rise to the surface. In spite of the propane being higher
density than air, some will diffuse to higher than the transom and
then will sink into the bilge, all basic physics. The hazard to my
boat from this canister was orders of magnitude greater than the
hazard to any other boat from an empty canister.

Stop digging. It's laughable to say a small cannister of slowly leaking
propane bobbing in the sea will blow up your boat.
A mere foot away from the canister the gas will be too dilute to
combust.
A fart is orders of magnitude more likely to ignite than any measure of
gas that gets to your bilge.
You have no certitude here.
Just nav hazard creation.