The name Corsair rock has sent shudders down the spine of many a seaman navigating Port Phillip Heads. The rock has been responsible for an extremely large number of shipwrecks and strandings. The rock itself is 6m in diameter and covered by 3m of water. The rock is located 600m west of Rock Beacon and can usually be identified by the swell breaking above it. When conditions are favourable the kelp covered top of the rock may be seen from the surface. When conditions such as this exist diving around Corsair Rock is at its best.
The terrain is ruggedly spectacular with huge gutters and bommies providing superb diving. The marine flora and fauna is equally spectacular with extensive kelp covered ledges concealing crayfish and many other reef dwelling creatures. Many schools of fish pass through the area and are well nourished by the prolific growth in the area.

To dive the area requires a good knowledge of the tides. Slack water is essential as the currents can be particularly fierce. A word of warning here is that after an ebb slack the flood tide will wash you into the centre of the Rip.