One should always go with local experience in making decisions regarding diving into currents. Surges occur in areas where swells are forced against a barrier of some sort, such as a beach, wall, rock, or wreck. Surges can be used to aid in your movement, carrying you forward in one direction where you can stabilize yourself as the surge retreats, and move forward again with the next surge. They are also dangerous since they create huge forces that can carry you into places that you don't want to go. Divers should remain distant from diver-size holes in wrecks and caves and learn to use surges as a method of aid in movement, either upward to get back into the boat or to move onto a ledge.
Wrecks create special problems with currents.
Frequently the boat will anchor on the wreck, playing out enough scope so that divers can easily descend on the line. A tag line is helpful placed between the anchor line and the stern of the boat, facilitating the descent from the dive platform. Divers who lose contact with the line run the risk of being swept away from the wreck and the diveboat, sometimes requiring rescue after coming up predictably exhausted from fighting the current.