Songfacts®:

• The US version of the album Under The Iron Sea takes the tracks "Put It Behind You" and "The Iron Sea" and combines them into one 6 minute song. The song first appears as a demo on the Keane documentary Strangers when their keyboard player/primary songwriter Tim Rice-Oxley plays it at Heliocentric studios.
  
  The track was composed in 2004 by Rice Oxley. On the UK version it is the 8th track, but for the international version, "The Iron Sea" is offered as a hidden song after "Put it Behind You."
  
  The song was also used as an outro on the single version of "Atlantic."
  
  On the albums track list the place where "The Iron Sea" track listing should be is marked as a slight change in font color from dark blue to a lighter shade blue.
• The song actually sounds like an "iron sea" with its fluid distortion rolling like glass waves on a metal ocean floor.