The Submerged Sentinel

An experimental submarine, the ISS Sentinel, carrying a revolutionary new energy device and the world’s leading scientific experts has missed several scheduled check-ins. The Enigma Fellowship has been contacted for help. Given the lives and scientific knowledge at stake your mission is to not only find the submarine but also rescue the crew. Can you locate the submarine and rescue the crew? Be prepared for a maritime adventure. There may be some deep diving involved. —description from the publisher