Could a flying boat use Hercules-style cargo doors?

Are there flying boats with large cargo doors like the C-130 Hercules or C-5 Galaxy?

No operational example is identified, but designs with large cargo doors exist and such an aircraft could plausibly be built.

No operational flying boat with cargo access comparable to a C-130 Hercules or C-5 Galaxy is identified, so the conclusion remains tentative. Designs with large doors on a flying-boat airframe have nevertheless been proposed, and no fundamental barrier to building one is suggested. This distinction between a studied configuration and an established aircraft type matters when assessing proposals for dispersed maritime logistics.