Dive site: The Aquarium Aquarium - Aquarium is the most northern dive site in the Columbus National Marine Park. It is also one of the very few dive sites that starts slightly deeper with depths under the boat of about 50 instead of the normal 30-35'. Like many of the northern sites, the soft corals here are extremely lush. The site is also unique to the other sites in that it offers a back reef of spur and groove coral formations. Being as far north as it is, the site can occasionally experience some light to moderate current - and rarely, the current can be quite strong. Fish & marine life is usually quite abundant.