My prior visit to the Galapagos only included a few hammerhead sharks, and they were down deep. This time, we saw them on virtually every dive, sometimes in huge schools like this. In addition to those visible to the diver (you can see about 50 just in this camera frame), they often continued off into the blue in every direction, with the total size of the schools numbering in the thousands. An awesome sight. Note: these schooling hammerheads are "scalloped" hammerheads, not the larger (and more dangerous) Great Hammerhead found in the Caribbean.