What should you expect when you encounter a tsunami in the open ocean?

Correct Answer: Option A — No noticeable change from the existing sea state

Tsunamis possess extremely long wavelengths, often exceeding 100 miles, and travel at high speeds in deep water. Because the wave height in the open ocean is typically less than one meter, the passage of a tsunami is generally imperceptible to vessels, lacking the steepness of wind-driven seas.