The rocket launcher cannot be fired underwater or under vacuum conditions. Like the MA-75 Assault Rifle/Grenade Launcher, it can also be used to propel the player to otherwise out-of-reach places at the cost of heavy self injury. The SPNKR-X17 (Lazyboy) of Marathon took up an extremely large amount of space in the player's viewport. The SPNKR-XP of Marathon 2 and Marathon Infinity also caused a significant blind spot, but not as great as the previous version. In Marathon, it is first found on Neither High Nor Low.