From a recent flight over Islas Coronados (Coronado Islands, Mexico) recently, seen here is the western exposure of North Coronado Island viewed from the southwest. Do you see the crack between the rightmost tip of the island and the main island? There is a narrow submerged passageway through that crack from the east to the west side of the island which we have swam through while diving. If the water in the slot is calm, there are often sea lions hanging out there. On this day you can see that the wave energy was high and it would have been a ass-over-teakettle tumbler of a ride for a diver to swim through that passageway.
North Coronado Island, aerial photo, viewed from the south.
Image ID: 21317
Location: Coronado Islands (Islas Coronado), Baja California, Mexico