Advice on Diving in Northern Mariana Islands

...are known for their beautiful beaches, perfect aquamarine waters, and the laid-back, unhurried lifestyle of its residents.  Only the islands of Saipan, Rota, and Tinian are permanently inhabited and the diving is considered some of the best in the world.  There are beautiful coral reefs dotted with tropical fish; the sunken ships and other relics of World War II; and stunning caverns and caves perfect for underwater photography.  The diving is diverse, but always has warm waters and great visibility.  Ranging over 400 nautical miles, the southern limestone islands are surrounded by fringing co...