The Great blue hole is a cylindrical trench located on lighthouse reef atoll, an island off the coast of belize. it is about 400 feet deep and holds about 2,349,911,302 gallons. how long will it take to swim across the great blue hole at a rate of 2 miles per hour. (1 mile= 5280 feet, 1ft cubed=7.48 gallons, 1 hour=60 mins)