Isla Adentro ("inner island") is near the south end of Isla Guadalupe and has two smaller islets near it: Church Rock and Roca del Skip. The gap between Adentro and Afuera is known as Tuna Alley for obvious reasons. The best dive among this group of rocks starts with a circumnavigation of Roca del Skip, where schools of scythe butterflyfish, yellowtail and medialuna are typically seen, followed by a bluewater (underwater) swim across the gap to Church Rock, where turtles, Cortez Chubb and walls of kelp are found.