Acoustical Bathymetry of Race Rocks
In February 1999 the hydrographic survey boat from The Institute of Ocean Sciences in Sidney, B.C. did an acoustical bathymetry program which mapped the seafloor around Race Rocks to a depth of 100 meters. The project was under the direction of James Galloway. This project will eventually involve two other components as well, grab samples at 40 locations underwater and underwater towed video to a depth of 20 meters.
Link to the reference : http://www.racerocks.com/racerock/hydrography/bathymetry.htm