“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."
--Larry Bond

"A Master Rivaling Tom Clancy."
--Publishers Weekly

--San Francisco Examiner

--Associated Press

"Superb storytelling."
--Virginia-Pilot/Ledger Star


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Delayed Neutrons -- -- Fission neutrons that, while born as “fast neutrons” with high kinetic energy and which have low probability of causing another fission, are slowed down by the moderator to become “thermal neutrons.” They are called “thermal” because they have only the kinetic energy that they would have based solely on their temperature. Thermal neutrons have a high probability of causing a new fission. If you want to have continuing fission reactions, you need to slow down the fast neutrons with a moderator so that the thermal neutrons can cause the next fission. In low-leakage cores, the reactor becomes closer to being critical on prompt neutrons. A nuclear bomb is essentially a low leakage core that goes critical on prompt neutrons.

Delta -- -- Name of a class of Russian boomers.

Depth Charge -- -- A gift dropped from a surface ship that detonates at a particular depth. Cheating skimmers may put rocket engines on depth charges and shoot them at you from a distance.

Depth Control -- -- Ability to control a ship’s depth within a narrow control band. Done either manually, with a computer, or with the hovering system (when stopped). Particularly vital at periscope depth because failure to maintain depth control may cause the sail to become exposed (broached), giving away the ship’s position, or keeps the periscope wet, risking collision with a surface ship.

Dailex -- -- Electrically powered phone circuit between officers’ staterooms, control, maneuvering, the torpedo room, the engineering spaces and the auxiliary spaces. Used for unofficial communications.

Direct Path -- -- When a sound wave received by sonar does not arrive by bottom bounce or surface bounce or layer bounce but by an almost straight line from the contact.

Dogs -- -- One answer to “what animals go to sea with submarines?” Banana-shaped pieces of metal that act as clasps to keep a hatch shut.

Dolphins -- -- Second answer to “what animals go to sea with submarines?” Pin worn above the left pocket of qualified submariners’ uniforms. Qualification typically takes a grueling year. Enlisted men wear silver dolphins and officers wear gold. Also a general logo for the Submarine Force.

Doppler Effect -- -- Effect responsible for train whistles sounding shrill when approaching and low pitched when receding. When a moving platform emits sound waves, the waves are compressed in the direction of platform velocity and rarefied (spread out) in the opposite direction of velocity. The compression of the waves raises their frequency, yielding a higher note. This also applies to a ping or pulse reflected off a moving platform – the return pulse will be up-shifted or down-shifted depending on the contact’s motion toward or away from the hydrophone.

Draft -- -- The depth of water a ship draws especially when loaded.

Dry-Deck shelter -- -- Used to store and launch a swimmer delivery vehicle[md] as well as combat swimmers

Michael DiMercurio
Princeton, New Jersey

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