Another night dive. There was much more of a swell swimming under the arch this time: a bit of a roller coaster, but beautifully silent and calm once we got down. Had to resurface because Mac hadn't put his drysuit feed in - this was a bit hairy because of the swell: almost bashed my head on the rock wall of one side of the arch. Finally got back down and it was even better than the previous night. Felt so serene and calm gliding through the darkness watching the multi-coloured rocks slide past the beams of our torches. As before we reached 30 metres and barely noticed. Eventually turned round and came back and as the water got shallower we were put back in touch with the real washing machine world on the surface.