Russian Navy, the reactor compartment of what used to be an Akula-class (NATO: Typhoon) nuclear ballistic missile submarine, the biggest submarines ever made, where the double hull design is perfectly visible.
Three decommissioned submarines of this class where scrapped under American and European assistance in the early 2000′s, as back then Russia didn’t posses the funds needed for such task.
Also known as razzle dazzle, designed not to conceal ships from submarines, but to make the estimation of their speed, heading and range difficult, resulting, in theory, in a poor estimation of their position, and therefore, poor accuracy of any torpedo launched at them.
Implemented during World War 1 after its conception by the British artist Norman Wilkinson, but during its use it was never successfully proved as effective, or ineffective for that regard, and so by the start of World War 2 it had been effectively passed out for more conventional paint schemes.