Volcanic detritus litters the floor of Las Canadas.

The original huge mass of the island was flawed by huge fissures. In the end vast portions of the island collapsed down into the sea. The wall at the back of this picture is part of the original island formation.

The fissures that caused the collapse were weaknesses in the earth's crust and caused an upwelling of magma and the formation of the volcanoes and the remains that we see now.