Tsunamis don't work like that!!

What a delightful pile of crap this movie was.

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A further feature of tsunamis is their relatively small wave height on the open sea - mostly between half a metre and one meter. Even though they can travel up to 1 000 km/h, these waves are generally not noticeable in deep waters. The wave itself only becomes dangerous once it reaches land. In coastal areas where water levels gradually become shallower, the wave will slow down but tower into a wave wall as much as 30 meters high. The reason for this is the mass of water and energy contained in the tsunami wave. Whereas only the upper water layers are being moved in wind created waves, with a Tsunami wave, an entire mass of water from the sea bed to the surface is in motion.

http://www.tsunami-alarm-system.com/en/phenomenon-tsunami/phenomenon-tsunami-formation.html

The CGI is cartoonish, the acting is like a 70s low budget porn film and I'm not sure why the writers allowed their names to be used in the credits.

But then again, I didn't watch Titanic 2 to learn about science, or history, I watched it in the expectation that it would be badly acted, badly filmed, badly written, badly directed and ironically funny. AND IT WAS!