The Sphere Tank or the Oil Tank (most commonly referred to as the dome) is a Monument often found on procedurally generated maps in Experimental Rust. The Sphere Tank has low levels of radiation. It's also the only monument which doesn't have a recycler.
The Sphere Tank has three significant features; three oil silos, the massive sphere with catwalks throughout, and two small shacks on the ground. The silos have stairs winding around them to climb to the top, where there should be a bunch of Loot Crates and Barrels containing loot or crude oil. The staircase and the top of the silos are somewhat guarded by sheets of metal and sandbag barricades. Underneath the metal sphere can be found many more barrels of loot and oil. The main part of this monument is inside of the Sphere Tank itself, where there can be found a lot of loot, but with the risk of parkour throughout.
To climb the tank, start on the opposite side of the silos and climb up the large pipe in the ground. After that, the path is very self-explanatory. Signs can be placed in certain spots to make the larger jumps more feasible. There are three main layers to the tank, and to access each one, you must climb out of the tank and around the outside. Inside can be found a fair number of easy loot chests, and an equally unfair number of risky jumps. Outside, there might be barrels, but mostly the danger of falling farther than you would if inside. At the top of the sphere are four military crates which have relatively great loot.
The Sphere is also a very great place even when radiation is in. It doesn't have nearly as much radiation as a train yard or water treatment plant it's even more rewarding since it always spawns four military crates.
The Sphere Tank offers access to two Oil Refineries located inside two small balls