Tide-Line Blue

is a Japanese anime series created by Satoru Ozawa and Umanosuke Iida for Bandai Visual and Telecom Animation Film. It aired on TV Asahi from July 6 to September 29 2005. A manga published by Akita Shoten's Champion Red magazine was serialized from issues August 2005 to May 2006.

Plot
An environmental disaster called the "Hammer of Eden" submerged 90% of the Earth underwater taking away six billion lives. Fourteen years after, the new and remaining countries merged together under the New United Nations. However, Gould, a renegade submarine captain wishes to use military force to create peace in the new world order, while Aoi, the secretary-general of the New UN, wishes to use diplomacy.