If you're curious about life below the waves but aren't a strong swimmer, hop aboard this 45-person submarine. Tours last 90 minutes and include 45 to 55 minutes of actual underwater travel at depths of about 3.5m (11 ft.). Big windows allow big views of a protected ecology zone offshore from Paradise Island Airport. The remainder of the time is devoted to an above-water tour of landmarks on either side of the channel that separates Nassau from Paradise Island.