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"http://openrov.com/ sort of thing you mean? Not a quad, but submerged brushless motors, usually slight negative bouyancy as it uses an umbilical for comms which can double up as emergency retrieval."
"John, "None at all" is the actual answer to how many take offs and landings with full tanks. It's only got a single Merlin engine which wouldn't get it off the ground fully loaded. The next Dragon to the ISS is due to be using a stretched first…"
"There are references to it being demo'd indoors and out in April 2009, so push back start of development another year and the 20 million contract pays for a team of around 25 across the five years. Not too bad for a complete system."
