“Compelling and visionary. DiMercurio’s characters run
as deep as his submarines themselves!”
--Joe Buff, author of Crush Depth and Thunder in the Deep
"DiMercurio really knows his subs...his characters step right off
the sub deck and onto his pages."
"A Master Rivaling Tom Clancy."
--San Francisco Examiner
XO -- -- Executive officer. Second in command of the submarine, reporting to the captain for the administrative functions of the ship. At battlestations, the XO is the firecontrol coordinator and is responsible for the target solution.