These photos were taken on a 10-day charter aboard Deep Blue in the Galapagos Islands in September of 2011. All were shot with a Canon 5D Mark II camera inside an Aquatica housing with one Ikelite DS200 strobe and one Inon strobe.
Sea lions are plentiful in the Galapagos. Since the scenery is mostly just dull and rugged volcanic rock (like this), large sea creatures like sea lions (and sharks, rays, etc.) are what attract divers from around the world.