Byford Dolphin Diving Bell

Origin
The Byford Dolphin drilling platform is currently situated in the North Sea. The rig has suffered several serious accidents during its operation, including an explosive decompression in 1983 that killed five workers and badly injured one.

Effects
When opened, sealed and reopened, it causes an immediate explosive decompression. This sudden change in pressure will cause extreme injuries and possibly death if they are directly situated near it. Furthermore, it creates the same but slightly weaker effect within any enclosed space it is in. The chamber and room will both pressurize after its closed and violently decompress when opened again.