[Bill]

Darn Ausi's. They keep picking on me.
I talked about pedal power with an engineer that built a few of those bicycle/canoe combos that can go 50% faster than Olympic kayaks, but when they tried a 'submarine' version, he said there was too much drag from bending the knees.
Back in the early 70's I bought one of the devices that Peter tracked down the patent on. The thing was hard to steer, but maybe no worse than a monofin. Diving in the kelp was impossible, but in a straight line, you could really get it moving fast. I lost it before I got used to it. The inventor did have the results of a test. I think it was a one mile straight run on scuba, he used 25% of the air that the navy diver used with jet fins and he was an old guy, in his forties.
By the way, we now have a very nice clean rope in 64 meters after two Sundays work by Matt, Leo and Carlos. I had the easy job of watching Annabel doing froggies.
Aloha
Bill