General Information
The Cargo ship, also known as the "CCSC Lazarus" is mobile Monument that only spawns periodically.
The Cargo Ship
When it spawns, it circles the map a few times, then leaves the area. There is no Radiation on the Cargo Ship while it is circling the map, but when it leaves, the Radiation poisoning quickly demolishes your health. The Cargo Ship is inhabited by Scientists and often other hostile players, so its not recommended for starting players to attempt to board the ship.
However, if you manage to stay alive for 2 minutes after the radiation starts, the ship will respawn all locked crates and stop the radiation, while seemingly disappearing off of the map. This is a great opportunity to get loot without the risk of running into other players.
The Cargo Ship has two variants. One being a version that is less cluttered, and clear. The other being a version that contains multiple colored stacked crates. The loot is almost entirely the same, yet different spawns occur. This may be the reason your teammates are confused by the different layouts, or a "Mandela Effect" feel caused by the ship.
Guide Video
Rust Monument Guide - The Cargo Ship UPDATED
Guide Video
Here's a guide video that shows you everything you need to know about the Cargo Ship. It includes information about how to get onto the ship, how to evacuate the ship, what kind of loot is on the ship and much, much more. However, since Rust is a game where you can be unique , there are different ways to play. This is a standardized video that shows the basics about the ship.