The Blue Hole New Mexico

The Blue Hole of Santa Rosa is a circular, bell shaped pool east of Santa Rosa, New Mexico that is one of the most popular dive destinations in the US for SCUBA diving and training. It is a clear blue body of water with a constant 64 °F (18 °C) temperature and constant inflow of 3000 gallons per minute. While the surface is only 80 feet (24 m) in diameter, it expands to a diameter of 130 feet (40 m) at the bottom.