When a Maine history teacher got back into diving, he surprised everyone (including himself!) by building an unlikely scuba club that’s uncovering the state’s maritime past.

Here are the best sites and conditions to prepare for when diving in the mountains around Denver, Colorado.

Sites stretch along the Golden Coast from Mendocino to Fort Ross.

Worthwhile wrecks and reefs stretch from Pensacola to Panama City.

This quiet lake is beautiful to dive, and the visibility is better than average for lakes. Four prominent dive sites are frequented for their scenic rock formations.

Unique dives abound in this landlocked state from Homestead Crater to the Blue Lake.

Unique dives abound in this landlocked state from Homestead Crater to the Blue Lake.