This explains why there are so many dangerous places to swim in Hawaii — the steep drop-off of mountains into sea.
-From Ted Fleming
“The Hawaiian Islands are a chain of massive volcanoes that stretch over 1,000 miles across the Pacific Ocean. Though some of these volcanoes reach nearly 14,000 feet above sea level, more of their height lies under the ocean’s surface. For example, Mauna Kea (on big island of Hawaii — 13,796 ft above sea level) is about 32,000 feet from the mountain’s base to the summit.”