The “deep dive” sounds alluring: sunken treasure, brilliant coral and the odd octopus. Sights we’re keen to see.

Plus it’s an easy trip to book. The staff meeting, book review and playbill all promise the “deep dive.” We show up to the conference room, bookstore or theater in wetsuit. Hours in, no one even gets damp.

Disappointed, we flop our flippers to the grocery store and net a pound of shrimp. We steam them fragrant in cloves and bay leaf and fold them into a seaside sandwich. It tastes of salt air and summer sunshine.

The excursion requires no fins or oxygen tank; it’s just a deep dive into delicious.