Current

A horizontal flow of water at a dive site, driven by tides, wind, or ocean circulation, that pushes divers along or forces them to work against it.

In scuba diving, a current is any horizontal movement of water across the dive site. It can be a gentle drift of less than half a knot or a ripping tidal flow that makes forward progress impossible. Currents are driven by tides, wind, waves, and large-scale ocean circulation, and they often change strength and direction with depth and with the tidal cycle.

Current dictates how a dive is planned. The standard approach is to start the dive swimming into the current so the return leg is easy, or to plan a drift dive where the boat follows the group. Fighting a strong current burns gas fast, raises your SAC rate, and invites hypercapnia, so experienced divers hug the bottom or tuck behind structure where flow is weaker.

Check the dive briefing for expected current and always carry a DSMB when currents can carry you away from the boat. Sites famous for current, like the Komodo channels or Palau's Blue Corner, reward divers who log the tidal state alongside each dive so patterns become obvious over time. A drift-style plan turns strong flow from a threat into the best part of the dive.