Consider the Coolidge like a ski resort. The 200m luxury-ocean-liner-turned-troop-ship has dozens of mapped routes ideal for beginners, intermediate and advanced divers. It’s the world’s largest wreck, and with beach access off the island of Espiritu Santo, Vanuatu, also among the most accessible. 

Beginners should target the bow, a shallow pick at 20m. On the promenade at 33m, find rifles, gas masks and helmets. Warm up on these areas, and if you’re still not tapped out, guides can lead you on a penetration dive of the two cargo holds as well as the medical supply room.