These nine dive destinations go from cold to coldest and put your cold water tolerance to the test. How low will you go for a dive?

Scuba diving in the Azores offers epic encounters with pelagic species such as blue sharks, sperm whales, devil rays and more.

Mako sharks. They might look like skinny great whites, but these lightning-fast sharks are in a league all their own. Here's where to scuba dive with them.