Blue whale is an interesting suggestion, but without Googling the subject, I expect that it would be quite low given that they are usually horizontal and immersed.
But, at the bottom of the ocean where the pressure is already under hundreds, if not thousands, of metres 'head' of water pressure. The pressure differential between heart and head may well be small, but the absolute pressure must be massive.
Blue whale is an interesting suggestion, but without Googling the subject, I expect that it would be quite low given that they are usually horizontal and immersed.
But, at the bottom of the ocean where the pressure is already under hundreds, if not thousands, of metres 'head' of water pressure. The pressure differential between heart and head may well be small, but the absolute pressure must be massive.
