Immersion Kit Dictionary search for 開口部

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開口 (opening,aperture (e.g. camera))

1: opening

2: aperture (e.g. camera)

部 (department (in an organization),division,bureau)

1: department (in an organization)

2: division

3: bureau

Consequently, it must be underwater.

つまり海中かいちゅうに開口かいこう部ぶがあるのです