Emergency drainage device for enclosed compartments

A drainage device for attachment to a housing, the drainage device comprising:

• an external plug component having a first cap section and a first attachment section, the first cap section positionable in an opening in the housing with the first cap section disposed over an exterior side of a housing wall;
• an internal plug component having a second cap section and an second attachment section, the second cap section positionable over an interior side of the housing wall, the second attachment section mating to the first attachment section to define a hollow cavity, the internal plug component defining a flow orifice allowing liquid to flow into the hollow cavity;
• and
• a liquid expandable component positioned in the hollow cavity, the liquid expandable component having a higher volume when contacted with liquid than when dry, the liquid expandable component pushes the internal plug component and the external plug component apart when the liquid expandable component transitions from a dry state to a liquid containing state thereby providing a path for liquid to escape.