Two Benthic Crawlers, Wally I and Wally II, have been deployed in Barkley Canyon hydrates thus far. They have both been developed by a team based at Jacobs University in Bremen, Germany. The suite of sensors mounted on Wally typically includes cameras, a compass, methane sensors, current meter, CTD, fluorometer, and turbidity meter. The goal is to help researchers carry out detailed investigations of processes influencing gas hydrates evolution at the seafloor. Wally crawls on dual tractor treads, which allow a full range of forward, backward and turning movement. Including the titanium frame, drive motors, sealed electronics chambers, wiring, lights, HD video camera, and sensors, its out-of-water weight is 275 kg. With syntactic foam floatation blocks attached, this is reduced to an in-water weight of 40 kg.
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