Ecuadortravel of Quito, Pichincha, Ecuador, runs liveaboard scuba diving expeditions to the Galapagos Islands, guided by PADI instructors with marine biology degrees. Their highly personalized programs are designed with serious divers in mind.
Galapagos Aggressor I & II offers week-long adventures to the Galapagos Islands, where you'll encounter a parade of rare and endemic creatures, such as tropical and cold-water fish species mingling together, schooling hammerheads, penguins, sea lions, eagle rays, turtles, mantas, dolphins, reef shark, marine iguanas and occasionally whales and whale sharks. Their site has info on making reservations as well as a questions & answers page.
Galapagos Sub-Aqua is the first dive center in the Galapagos Islands. Their services include liveaboard diving, hotel packages, daily diving tours, equipment rentals and diving courses.
Lammer Law liveaboard is one of the world's largest trimarans and makes regular sails to the Galapagos Islands. There are nine double staterooms, each with individually-controlled air-conditioners, vents, windows and private head with shower. The Lammer Law provides a competent and friendly crew of 10, including two naturalist guides from the Darwin Station.
Scuba Iguana offers day-trip diving to more than 30 sites in the Galapagos Islands. Their hotel features 14 rooms on 5 acres of natural seaside gardens. They supply all the equipment, so that you do not have to travel with all your own gear. All dives are accompanied by bilingual divemasters.