Breathing underwater, like eating fireworks, constructing a monument, and getting married, should only be attempted if you're confident you can do it. Today's Groupon gives you all the skills you need to mingle with the mermaids: for $50, you get $100 toward lessons or merchandise at Lehigh Valley Dive Center in Bethlehem.

Curious dive dabblers can test the waters with a Try Scuba Diving class ($40) that takes intrepid explorers into the pool to try out Lehigh Valley’s equipment and determine if life in a self-contained underwater breathing apparatus brings them uncontained joy. Cousteau-copying Groupon holders can also opt for classes such as the Open Water course (up to $340, including equipment and fees), which teaches diving basics during at least three full pool sessions, two lake sessions, and one tête-à-tête with an opinionated kraken.

The expert fin fanatics at Lehigh Valley cater to the needs of seasoned snorkelers and scuba rookies alike with an abundance of aquatic equipment. Put taunting seals in their doe-eyed place with a new set of dive fins ($69.99–$239.99), or free a frantic merman caught in a fishing net using nothing but a commanding knowledge of merspeak and the blade of a new dive knife ($27.99–$79.99). Snorkels ($16.99–$44.99), when used properly, prove to be helpful breathing tools both underwater and when trapped under the quilted rubble of a collapsed blanket fortress.