A modular compartment bulkhead assembly is provided that includes a first external body, a bulkhead, and a second external body. The first external body segment may include a first end portion. The first end portion may be coupled to an external seal body and the external seal body may include a first internal channel. The bulkhead may include an internal seal body. The internal seal body may be configured to be inserted into the first internal channel of the external seal body to form an internal seal between the bulkhead and the first external body segment. The second external body segment may include a second end portion. The second end portion may include a second internal channel, and the external seal body may be configured to be inserted into the second internal channel to form an external seal between the external seal body and the second external body segment.