This charming concertina book follows the journey of a little submersible on a voyage beneath the waves, down into the deep dark ocean and back again. Folding out to nearly 2.5 metres, children can look at all the different things the sub sees on its way, as it travels past a shipwreck, through a coral reef, near to a pod of orcas hunting for their lunch, close to a leatherback turtle feasting on jellyfish, and past some rather strange deep-sea fish.