In Deeper into the Darkness Rod takes the reader diving to explore many more famous wrecks around the UK from the Great War. These include HMS Pathfinder and HMS Audacious ¿ the first British battleship to be lost to enemy action in WWI. The wreck of HMS Hampshire on which Lord Kitchener perished on a secret mission to Russia in 1916 is visited along with HMS Vanguard, which blew up at anchor in 1917 in Scapa Flow. The K-class submarines lost in the Firth of Forth during the Battle of May Island in 1918 are dived, along with UB-116, the last German submarine to be sunk in action in October 1918. Rod then leaps forward in time to the Pacific during WWII and visits the American shipwrecks from the Battle of Guadalcanal, along with daring penetrations into the stunning Japanese wrecks lying at the bottom of the Truk and Palau Lagoons. The development of technical diving is brought up to the present day where closed circuit rebreathers utilising mixed breathing gases allow Rod to go deeper into the depths in search of lost shipwrecks. The wreck of the SS Creemuir, torpedoed and sunk off north-east Scotland in 1940, was first dived by Rod in 2012. This exploration reveals the human side of shipwrecks when Rod¿s team recover the Creemuir¿s bell and present it to the sole surviving crewman, Royal Navy Radio Officer Noel Blacklock.

The latest developments in shipwreck exploration taking place at Scapa Flow are recounted before the book concludes with the scandalous desecration of the naval war graves of many nations at Jutland, the South China Sea and the Java Sea.