John, we are in agreement.
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My situation is a little different, but last night at the LDS "Fun dive" at the Natatorium pool (18') I took my prosthetic off and swam around for a little while with one leg.).
In you situation with an above the knee amputation some have just put the fin on the stump and that has worked for them, others have had a prostetic leg made. A lady I dive with has one (she is BK) that she locks into a walking position until after she is in the water (avid beach diver) and then rotates the foot into swim postion and locks it there.
Arm swimming is good in zero to very mild current (less than .2 knot).