The harrowing story of five men who were sent into a dark, airless tunnel hundreds of feet under Massachusetts Bay to do a nearly impossible job-with deadly resultsIn the 1990s, Boston built a sophisticated waste treatment plant on Deer Island that was poised to show the country how to deal with environmental catastrophe. The city had been dumping barely treated sewage into its harbor, coating the seafloor with a layer of and "black mayonnaise. and " Fisheries collapsed, wildlife fled, and locals referred to floating tampon applicators as and "beach whistles. and " But before the plant could start operating, a team of divers had to make a perilous journey to the end of a 10-mile tunnel-devoid of light and air-to complete the construction. Five went in; two never came out. Drawing on hundreds of interviews and thousands of documents, award-winning reporter Neil Swidey re-creates the tragedy and its aftermath in an action-packed narrative. The climax comes when the hard-partying DJ Gillis and his friend Billy Juse trade jobs at a pivotal moment in the mission, sentencing one diver to death and the other to a trauma-induced heroin addiction that eventually lands him in prison. Trapped Under the Sea reminds us that behind every bridge, highway, dam, and tunnel-behind the infrastructure that makes modern life possible-lies unsung bravery and extraordinary sacrifice.