Marina del Rey has 3 very important hazards

1. The submerged pipeline that extends west from the Hyperion Waste Treatment Plant floats less than 6' . Below the surface at low tide. It is marked at its seaward end by the R "2ES" buoy. The tanker ships that park off El Segundo pick up their mooring cables there. These cables, as well as the pipeline will tear off any sailboat's rudder.
2. In the not too distant past there was a small marina near the Santa Monica Pier, protected by 'a breakwater running perpendicular to it - until a storm dashed it! Part of it is still there, though, mostly submerged, and extending less than 100 yard west of the Santa Monica G "I" which marks safe water to the west
3. When Burton Chace designed the marina, it didn't have a breakwater, and so lie wouldn't have anticipated the erosion that would happen at its south end. Every year it all but fills in the area between tile South jetty and the breakwall. Because of this, all mariners must use the North end for entering and exiting the marina.