Extreme Planet: the DeepA highly illustrated, carefully researched flap book about the mysterious depths of the ocean. Are you brave enough to delve into the chilling darkness of Extreme Planet: the Deep? With no light, no heat and miles of sea above you, it might be the strangest, most extreme place on Earth. So, climb inside the submersible and plunge deep down beneath the sunlit surface where you'll discover disturbing and unusual creatures, explore alien looking worlds,