Adds massive cargo ships to the game, that function similarly to trains. Also adds deep sea oil, oil platforms, tanker ships, train bridges and other water based content.
I have noticed across several offshore oil patches that some of the oil will spawn with a single tile of separation between the 3x3 oil slicks.
As the oil rigs are 7x7 and (from observation) need to keep the 3x3 oil slick within a 5x5 box at the center, the oil slicks spawning close together prevents oil rigs from being placed on all patches.
