A bit south slightly west of Tatawa Island is a rocky islet called Batu Besar, literally "Big Stone", the location of a site called "Current City". East of the islet, as the same suggests, currents can regularly top knots, making diving a bit of a headache. If the current is this strong along the East face, however, it is usually fairly calm along the west.
The west face of Batu Besar offers a series of steep drops to about 30 meters, and several nice coral caves. The soft coral cover is very good, and there are lots of fish, includ-ing large schools of sweetlips, Sharks are common here, as are turtles, and we have seen very large reef rays here.