Roca Redonda is located well away from the other islands. The monolith thrusts from the ocean's surface with shearwaters and petrels skimming the water all around it. Schools of hundreds of barracuda are hardly bothered by the intrusion of divers. Huge schools of various tropical fish rival the most diverse Indo-Pacific reefs and the exquisite Harlequin Wrasse found here is a target species for every fish photographer. Roca Redonda also offers good sea lion encounters. Sometimes you'll find them resting quietly at the surface waiting to tease the ascending divers.

Bubbles of hydrogen sulfide percolating through the sandy bottom are evidence of the ongoing volcanic activity in these islands. Stacks of boulders covered with barnacles and orange sponges form a slope down to about 50 feet, where the bottom levels out in volcanic rubble.

Schools of yellowtailed surgeonfish, Galapagos grunts, king angelfish and of course scalloped hammerheads are likely to be seen here.