Richard wrings water out of his clothes
Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!
Richard tried to block the leak before using a bucket to move the water. He then moved butt A, then desperately tried wringing out his boiler-suit and even tried extracting water from the ground with a balloon pump. He moved 1 foot of water into butt B.
(Written by Taskmaster Wiki contributors)