Submersible power distribution system and methods of assembly thereof

A power conversion module for use in an underwater environment, said module comprising:

• a first enclosure exposed to the underwater environment, said first enclosure defining a first interior cavity having a first pressure;
• at least one second enclosure positioned within said first interior cavity, said at least one second enclosure defining a second interior cavity having a second pressure that is lower than the first pressure, said at least one second enclosure to restrict exposure of non-pressure-tolerant power electronics in said second interior cavity to the first pressure;
• and
• a wet-mateable connector coupled to said first enclosure and extending between said first interior cavity and the underwater environment.

A method of assembling a power conversion module, said method comprising:

• providing a first enclosure exposed to an underwater environment, the first enclosure defining a first interior cavity having a first pressure;
• providing at least one second enclosure defining a second interior cavity having a second pressure that is lower than the first pressure;
• identifying non-pressure-tolerant power electronics of the power conversion module;
• positioning the non-pressure-tolerant power electronics within the second interior cavity, wherein the at least one second enclosure restricts exposure of the non-pressure-tolerant power electronics in the second interior cavity to the first pressure of the first interior cavity;
• positioning the at least one second enclosure within the first interior cavity;
• and
• coupling a wet-mateable connector to said first enclosure and extending between said first interior cavity and the underwater environment.