Its not a 50ft wave, its 50ft of backwash

Its not a 50ft wave, its 50ft of backwash just about to dump on two spongers in Penzance check out this shot at the Daily mail from last Sunday. Think it confirms everything I know about spongers, its not what you do on a wave, its about how deep you can go, or how deep you can be drilled into the bottom!