When a dive off the coast of Alabama goes horribly wrong, twelve-year-old Julie and one of her father's scuba clients struggle to survive after reaching an abandoned oil rig.

Despite her fatal allergy to sunlight, XP, and the risk to all she holds dear, Allie Kim is determined to see Garrett Tabor brought to justice and may get her chance when she and Rob uncover a horrible secret Tabor has hidden under Lake Superior.

A dog becomes friends with a whale and learns how to scuba dive while the whale sings to him, then Scuba Dog surprises whale by playing the tune of her song, and whale returns with a surprise of her own--a baby whale.

Jacob and Shannon Brenner are recruited as scuba divers to lead a dangerous recovery operation-- an undersea submarine is leaking a dangerous substance.

Twelve-year-old Jasmine Lopez loves exploring the coral reefs around Fiji where her marine biologist parents are stationed, and though young, she is already a certified scuba diver, a fact that her ten-year-old brother Arjun seems to resent; in fact he seems to believe he already knows everything about diving, and certainly does not want help from his older sister--until his overconfidence and defiance leads them both into a confrontation with a reef...