Boston seems to have a penchant for huge engineering projects. The Big Dig might have been the attention-monger in its day but the cracks slowly making its way through Trapped Under the Sea belonged to yet another money-guzzler, the Boston Harbor cleanup. Part of this expensive solution involved work in constrictive underwater tunnels under extremely hazardous conditions. Neil Swidey deftly chronicles the divers’ problems and the disaster that unfolded. Even if at times the personal lives of the workers read too much like a made-for-television movie, the thoroughly researched narrative is superbly paced and the engineering details are incredibly absorbing.