While my husband and I have only completed the entry level course, we have yet to feel restricted when exploring the reefs of Southeast Asia. The Open Water certification allows us to dive to a depth of 18 meters (to go deeper, you need an Advanced Diver certification), but I’ve found that most dive spots in the region can be enjoyed within this range. While the Advanced qualification allows you to do night dives and to go down to 30 meters, the main reason I’m considering earning it is to be able to more thoroughly explore shipwrecks. Encountering a turtle amidst the remains of the USAT Liberty, a relic from the Pacific War just 30 meters off of Bali’s shore, was nothing short of magical. And hovering alongside the teeming hull of a sunken sugar transport ship off the Perhentian Islands was one of the most breathtaking (no pun intended) sights I’ve ever seen. Yes, I pretend I’m the little mermaid every time.