question regarding divers in Tsunami

[Hank49]

It won't be a large breaking wave, it would appear to be the water simply rising since it's not at all steep. The water did recede slightly beforehand, which also makes sense.. that's simply the bottom of the wave..

The bottom topography has a lot to do with how the approaching tsunami will behave. Have you seen the video where the wave is breaking perfectly (Big tube....from a surfer's point of view) to the right just before it hit? The difference between that and a twenty foot storm swell wave generated in the Gulf of Alaska, hitting Waimea Bay in Hawaii, is there was 3 miles of swell behind the tsunami.