In the second bit I thought I could see a length of string/rope floating on the water - they may have tied a length of rope to the bike with something that floats, so they can pull them back up afterwards.
I've seen UK lake jumpers fill within their spokes with pumped-up inner tubes to keep the bikes afloat. Not sure I'd want to tie a BMX to my ankle and jump in a lake - you'd have to be a pretty confident swimmer.
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