After looking at a number of these vids my guess is that it's likely they were
taking on water from the start and it was this weight increase that accelerated
their rate of descend, I think this way because it seems to me that the rate of
descent was not linear but was increasing as they went down. Then when they
decided to attempt to ascend they couldn't rise much at all. Then the batteries
began to go red, indicating the water was short-circuiting them.
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