I see where Mauna Kea is considered the tallest mountain in the world because it's measured from its peak to its base on the ocean floor.
I wondering exactly how this measurement was done. How did they determine the exact spot where the mountain ends at its most distant point from the peak on the ocean floor? It must be an exact spot too because the official height is listed down to the foot (33,476 ft.)
Any replies will be very much appreciated!