From the back cover: In Boomer, the crew of the Corpus Christi discovers a chilling fact: a Soviet Typhoon-class nuclear missile submarine is alive and well. Worse, it has three of its missiles and their warheads. Information presented in this module includes: Source material and maps for Norway and the Svalbard Archipelago. Background material on how the Soviet sub came to be trapped in the ice and on the operation undertaken to recover it. Rules for traversing the Arctic ice pack, and a discussion of the special dangers and encounters to be found there. Boomer is the dramatic climax to the Last Submarine trilogy and brings the series to a close with a daring assault over the polar ice.