Asan Cut – Hagåtña Bay & Asan

Site Overview

Asan Cut is an exhilarating channel drift dive that channels the full force of tidal currents through a narrow reef passage, creating one of the most adrenaline-filled diving experiences on Guam. The channel funnels nutrient-rich water that attracts reef sharks, whitetip sharks, big-eye trevally, tuna, and schooling barracuda in impressive numbers. The strong current carries divers through the passage at speeds that make finning unnecessary, allowing you to simply drift and observe the spectacular pelagic action unfolding around you. Grey reef sharks patrol the channel entrance while whitetips cruise the deeper sections, and large schools of big-eye trevally and tuna hunt along the current-swept walls. The channel walls are covered in soft corals and gorgonians that bend dramatically in the current, creating beautiful wide-angle compositions. This is an advanced dive site that demands good buoyancy control, comfort with strong currents, and experience with drift diving procedures. The surge at the channel entrance can be significant, adding to the wild and untamed character of this remarkable dive site. The channel formation has been shaped by thousands of years of tidal flow, creating smooth limestone walls that provide excellent surfaces for soft coral and gorgonian colonization. The nutrient concentration effect of the channel creates a feeding corridor that sustains one of the highest densities of pelagic life observed at any dive site on Guam.