"The Home of First Class Diving", located deep in Southern Illinois, Mermet Springs is an 8.5 acre spring-fed quarry that has been developed for recreational scuba diving and dive training. Diver safety, convenience and service are emphasized by the excellent staff. UW features include a Boeing 727 fuselage and pre-historic Spoonbill Paddlefish.

More info here (right click link to open in new tab):
- https://www.mermetsprings.com