Ya might wish to file this away for future reference or ignore, but when I was still a young guy, I plus friends usta tow a piece of long narrow flat and thin piece of plywood (swimmer hanging on via hands holding ends, etc. of towed skiing tow rope tied to board, and boat rope end of line to any convenient bollard, towing/tying device. With face marks and divers snorkel (Modern "J", nothing like that Roman Leo-wattEVer guy:
... etc. Besides our rental cottage to see underwater, the whole bay flooded years ago to build at the top of the chain of the Rideau Canal system (in case any pesky neighbours came again - money involved.), so clear water plus rotting bottom rooted old tree trunks, etc. as far as the eyes can see (and one could swim through hehe).
ES changed my life (for the waaaaay better).
Eff. June, 2014 Phoenix Ebike Promotions
(Current ride? High speed lawn chair.)
Phoenix Ebike Promotions conversion kit (work in progress. More drink holders, etc etc)
Joined yer local chapter of EA yet?
(Ebikers Anonymous - Where we're all miserable failures, but the parties are hilarious...)