A hull support structure of a liquefied gas tank has a foundation deck disposed around a liquefied gas tank; a skirt which supports the liquefied gas tank on the foundation deck; an inner bottom plate extending in a hull length direction, at a location that is below the liquefied gas tank; and a pair of bilge hopper plates each of which is provided between the foundation deck and corresponding one of both end portions of the inner bottom plate, wherein a plate connection section at which each of the pair of bilge hopper plates is connected to the foundation deck is disposed outward in a hull width direction, relative to a skirt connection section at which the skirt is connected to the foundation deck.

This disclosure describes systems, and methods for bulkhead connectors, systems, and methods for coupling modules together to form an electrical connection between watertight modules. The bulkhead can include a first face comprising a first guide rail; a second face, parallel to the first face and defining a first slot shaped to receive a second guide rail; a third face, perpendicular to the first face and the second face, the third face defining a first recess configured to receive a first connector plug; and a coupling configured to affix the bulkhead to a hull.

This disclosure describes systems, and methods for bulkhead connectors, systems, and methods for coupling modules together to form an electrical connection between watertight modules. The bulkhead can include a first face comprising a first guide rail; a second face, parallel to the first face and defining a first slot shaped to receive a second guide rail; a third face, perpendicular to the first face and the second face, the third face defining a first recess configured to receive a first connector plug; and a coupling configured to affix the bulkhead to a hull.