I picked up a copy of this cheap on eBay, which is good as Springer-Praxis books are not cheap. But they are interesting. The subtitle of this one reads “The future of humans living underwater”, and it covers a variety of different methods of doing so. The first section covers diving – free-diving, technical diving and saturation diving – but while the studies on free divers is interesting, the section on rebreathers reads like a technical sales brochure. The second section is about submersibles, but covers only Mir, Alvin and Shinkai before turning into an advertisement for hydrobatic submersibles (ie, ones that “fly” underwater). Section III deals with the reasons for colonising the ocean bottom, such as mineral exploitation, and the final section is about medical intervention to allow survival underwater. It’s fascinating stuff, despite the book’s tendency to read at times like it’s quoting verbatim from technical sales material; and while it’s good on the science and engineering of the current state of the art, it’s not so good on the history – the chapters on submersibles, for example, make no mention of the Trieste or Ben Franklin. But then it is a relatively slim book, only 187 pages, including appendix, epilogue and index. Nonetheless, pleasingly detailed. ( )