Besides a guerre de course, naval exercises have shown that submarines are a viable defence against an invading landing force. For example, in the Joint Winter exercise in 2004, HNoMS Utvær (small Norwegian diesel-electric, 1150 t sm) had to be disqualified so that the strike force (mostly RN ships) could proceed to the landing site.
But a full-fledged amphibious landing is unlikely to happen anytime soon.
So what are an attack submarine's main tasks today? Well, in lieu of economic war, submarines are best suited for recon, and as said, deploying special forces.
And kapitain, sorry to disappoint you, but Jahre Viking does not longer split the oceans with its majestic prow. It is renamed Knock Nevis and is permanently moored off Qatar as floating storage for crude oil. The reason for this is that it soon will be disallowed to enter European and US waters. Knock Nevis is only single-hulled and considered too much of a risk to the environment.
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