If you choose to stay in your building you need to go to the fifth floor or higher to be safe from a tsunami. You should only stay in your building if you think it is more dangerous evacuating by foot.

Tsunamis can cause great loss of life and property damage in coastal areas. Very large tsunamis can cause damage to coastal regions thousands of miles away from the earthquake that caused them. Beaches, lagoons, bays, estuaries, tidal flats and river mouths are the most dangerous places to be.

There would be a lot of damage, and small buildings would be destroyed, but the larger buildings would survive. Look at other areas hit by tsunamis. The large buildings survive. Take a look at pictures of Aceh, Indonesia, or Japan, or other places they have hit.

2. The ocean could be affected by high tsunami and/or pressure waves in the case of a large asteroid or comet impact. Most current submarines can survive at a depth of 400 m, so they might survive long pressure spikes created by the waves above them as high as 200–400 m, but not kilometer size waves.

US Navy With deployments underwater typically running 90 days, life onboard a submarine is anything but normal. To even be eligible to be a crewman aboard a submarine, applicants must pass a series of grueling tests, psychological evaluations, and intensive courses.

Life Is Divided Into Three Six-Hour Segments Forget living a normal life while on a submarine, you live and die on a strict schedule. The hardest thing might be adjusting to the three, six-hour segment routine you have to endure. Crew members get six hours for sleeping, six hours on watch, and six hours for free time.

Seawolf class