Slipping back into the deep Blink and you may very well miss Cmdr. Christopher Ellis’s quick-as-lightning descent down more than a dozen ladder rungs. “You get used to it,” he says, appearing all of a sudden, it seems, deep inside the submarine he commands at CFB Esquimalt, where the sun’s rays are replaced by artificial lighting and the only view outside is through two periscopes. The submarine captain’s every movement is economy in motion, exuding precision and control – important qualities for submariners to have when working at depths known only to marine life, and 400 other submarines possibly lurking...