- The murderer completely seals the room from the outside so that no oxygen can go in, and waits for the victim to suffocate. - Similar but just prevents the

- The murderer completely seals the room from the outside so that no oxygen can go in, and waits for the victim to suffocate. - Similar but just prevents the victim coming out long enough for them to die of thirst. - Murderer comes in with heavy machinery and breaks down the whole building except for the locked room, then lifts the locked room and drops it off a cliff.