A large hole within a hole. The red dots are 10 cm apart. Thus the bottomsquared off hole is at least a 1/3 of a meter cross, while the largersurrounding hole is more than a meter across.
4/10/2019 12:58:55 PM
Date: 2011 August 8
Credit: NOAA Okeanos Explorer Program, Mid-Cayman Rise Expedition 2011
Location: Caribbean Sea, Mid-Cayman Rise