ISBN-13: 9781540526229 / Angielski / Miękka / 2016 / 30 str.
Bop and Grop take their grandsons, Declan and Chace, on an ocean adventure. They enjoy the beach together, camp out, learn about some undersea creatures, and end up in a bathyscaphe that takes them down deep under water. Will the dolphins they encounter help them make it back to the surface?