Phil has passed the classroom portion of his scuba certification and is ready for his confined water dive. His "private tutor," Jeremy, has suggested they go to a local quarry and explore some of the sunken objects in it. They find the quarry almost deserted, and they waste no time getting started exploring. When they come across an old school bus, Phil and Jeremy decide to take advantage of their peaceful surroundings to go "even deeper" with each other. After a sexy time in the bus, they move on to a sunken automobile and take it for a "spin." Will Phil pass the test, or is he in over his head? This short erotic tale features gay sex, both oral and anal, manual sex, and lots of bubbles.