"Undersea adventure" refers to a thrilling and exciting experience taking place in the ocean or sea, usually involving exploration, discovery, and encounters with marine life. Full definition
We are happy to say that we just bought two new engines to replace the twin Optimax we had on Undersea Adventures [cont.] (stmaartendiving.com)
Giant Squid's Abzu, which debuted in August 2016 on PS4 and Windows PC, is a gorgeous undersea adventure in which the player steps into the flippers of a diver and swims with a wide variety of marine life. (polygon.com)
From the Academy Award ® — winning creators of Disney • Pixar's «Finding Nemo» (Best Animated Feature, 2003) comes an epic undersea adventure filled with imagination, humor and heart. (dvdizzy.com)