(Sept 2021, bes)
Wikipedia: Blue Holes
Exceptionally well preserved late Quaternary plant and vertebrate fossils from a blue hole on Abaco, The Bahamas; PNAS 2007
BLUE HOLES: DEFINITION ANDGENESIS (Seminal Paper)
Discovery Live: Into the Blue Hole (Advertisement - Dec 2018; see Discovery Plus for full Episode)
http://esr.monmsci.net/wiki/index.php/Bahamas_Blue_Holes
Open ROV at Monmouth College