[fso301]

If they had experience with large surf, they would know to flatten themselves on the bottom just as the wave hits.

[Lazamataz]

If they had experience with large surf, they would know to flatten themselves on the bottom just as the wave hits.

Might work for normal waves.

Doubt it would work here.

[Red Sea Swimmer]

Too much force in the tsunami wave/s even for that maneuver. I've done the same maneuver in big surf, but if you are submerged for more than a minute or so and the waves keep rolling over you with no stop you will not make it to the surface for air. It would be like being in a huge, chaotic, diabolical washing machine.