Scientists working alongside the U.S. Coast Guard have discovered a 1,640-foot-tall (500 meters) structure that looks like an underwater volcano off the coast of Alaska.
The structure may be spewing gas, based on data collected from the water above it, but the scientists still aren't certain. Whether the structure turns out to be a volcano or not, it is 5,250 feet (1,600 m) deep at its shallowest point, meaning it poses no risk to navigation, according to a statement.
