Could Scapa Flow be a modern submarine base?

Would Scapa Flow work as a modern submarine base?

Not without extensive infrastructure, because the islands remain disconnected from the support and transport networks a submarine base needs.

The water space is suitable, but the water space alone is not enough. Submarines need maintenance, people, stores, communications, transport, and reliable links to national infrastructure. Ferries cannot substitute for the continuous heavy supply chain of an operational submarine base. Without a new railway, tunnel, bridge, or comparable large-scale construction, the island location leaves Scapa too disconnected for such a role.