Ot Di Ma is a Raja Ampat reef dive reached by a longer boat run from the local dive-center network. The site begins as a coral garden and shallow reef before rolling into a longer slope, so the underwater route naturally shifts from close reef detail to blue-water scanning. When the current lines up, it turns into a fast-moving drift with schooling fish, turtles, reef sharks, and passing pelagics, so good timing and steady buoyancy matter more than lingering in one spot.