Mukilteo T-Dock is a shore-access Puget Sound dive near the ferry terminal, where boulders and cobbles lead toward pilings, a geodome, and a sandy bottom. The site is known for rockfish, lingcod, sculpins, crabs, shrimp, nudibranchs, octopus, seals, sea lions, and other Northwest marine life. It is a useful training and exploration site, but tides, visibility, and harbor traffic can change the feel of the dive quickly.