Underwater boat tours grant passengers candid glimpses of sea life’s everyday existence, from a school of fish’s morning bell to the last gavel at Atlantis’s city council meeting. Spend a day in the life of the deep with today's Groupon to Catalina Adventure Tours. Choose between two tour options:

• For $44, you get a glass-bottom boat tour for four people aboard the Sea View (up to a $98.68 value, including tax).
• For $90, you get a boat tour for four people aboard the semi-submersible SS Nautilus (up to a $191.44 value, including tax).

Catalina Adventure Tours’ aquatic guides unlock the secrets of undersea living on one of two 45-minute tours. Whether safely submersed below sea level aboard the military replica SS Nautilus or gazing through the Sea View_’s glass bottom, customers search the waters for rapid growing ladder kelp, boisterous fish, and reflections they think are sea spirits. Wide viewing ports immerse passengers in oceanic ambiance and feeding systems on both boats let passengers jettison food for hungry fish (food shots are available for an additional fee). Passengers on the _S.S. Nautilus also embrace their submarining alter egos, interacting with staff members clad military style garb while reading mission briefings or studying pictures of local species of fish and other sea life on an extra large plasma screen. Catalina Adventure Tours also runs evening missions, with guides serving as curators of ocean nightlife and designated drivers for seahorse discotheques.