A research probe carrying the first living sample from the bottom of the Mariana Trench has failed to come up. Isla and Marco dive eleven kilometres in the Lantern to find it. Isla knows one thing for certain: nothing down there makes light, so any light they see must be the probe.
Ocean Quest
Ages 10–12Ocean Quest is a series of illustrated adventures for readers aged ten to twelve about the ocean, its life and its history. Isla, a free diver, and Marco, a history buff, are the junior crew of a small research submersible flown by an AI captain that answers every question in a riddle. Each book delivers one ocean topic through a real dive with a battery clock, and shows how people found out what lies below.