Oceans are the earth's final frontier, holding thousands of uncategorized species of fish and one plastic bag filled with loose doll hairs. Uncover the mysteries of the deep with this Groupon.

Choose Between Two Options

• $75 for a pool or open-water discovery dive (up to a $150 value)
• $139 for a PADI scuba-certification course (a $285 value)

Discovery dives explore the indoor pools at Water's Edge Aquatic Center in Bensenville, on the UIC campus (a $100 value), into open water at Kankakee's Haigh Quarry, or at the Illinois Institute of Technology's Keating Hall (a $150 value; $20 admission fee to quarry not included with this Groupon). Equipment is provided by Learn Scuba Chicago. PADI certification courses include online materials, one pool dive with equipment included, and one quarry dive, for which equipment is included.

Learn Scuba Chicago

Despite a close encounters with a hammerhead shark, Learn Scuba Chicago's Captain Bob just keeps on scuba diving. The aquatic expert got an up-close peep of shark teeth on his very first Caribbean dive, yet has scarcely taken his flippers off since. When he isn't maintaining underwater habitats at the Shedd Aquarium, Captain Bob leads diving courses, which range from thrilling dips for beginners to rescue-diver certifications. Students plunge into indoor pools at Water's Edge Aquatic Center in Bensenville and the UIC campus, or travel to the open water of Kankakee's Haigh Quarry. Depending on the course, Learn Scuba Chicago lends or sells student equipment such as masks, fins, snorkels, and gills.