Here's an interesting little fact: there are only 37 aircraft carriers in the world. It seems like there should be more, but if you think about it the low number makes sense: the largest aircraft carriers are nuclear powered, and they can carry up to 90 military aeroplanes.
Why am I talking about this? Well, thanks to Rust there was a brief period where that number was 38. Forum user NexusOne showed off the fruits of his labour, displaying a water-based build of a small ship he built with the help of God Mode.
But that didn't last, and the USS Skankville was refitted, as he put it turned "her into a Submarine, complete with Galley, Missile Bays, Conning Tower (which are still a work in progress) plus she's going to be lengthened a bit to be on more of a proper scale with real wooden submarines the world over."
And if you're worried about the submarine moving too close to the land (don't be - it can't move), then forum user Lameklamek has the perfect solution: an atmospheric lighthouse jutting out into the water. The builder writes: "Nothing too special. It's built on a peninsula of land and contains the lighthouse tower, as well as a boarding station for the operators. With the fires lit on the top, it made for a pleasant piece of scenery come sunset."
It's very simple, but it's lovely and evocative, which makes a nice change from the utilitarian murder-blocks that tend to dominate the Rust landscapes. Also: check out that aspect ratio!