Tidal basins and ocean bottoms are very different from the open ocean surface. Much like tree tops and 3 miles in the air are different. Both are up in the air, but still quite different, just like "ocean" but still different.

You know monkeys can swim? Do you know what happens to a monkey 2-6km under the surface? Monkeys can also climb trees, very high. Monkey still no condor, sadly.