Mean While back at the point
It always make me smile when the expets say that all the noise hurts the cetaceans - it probbably does I'm no expert.
But why do they come and play with ships, I've seen dolphins and whales playing with seismic survey vessels even rubbing themselves on the airgun arrays whiles they fire (the air guns release a slug of high pressure air to create an acoustic pressure and its reflections are measured).
Surly if it hurt them they would leave and not stay and play?
Now we had to slowly increase the presure so if they want to leave they can before it gets to noisy and have to stop if we see any cetaceans.