Future Submarine Concept: Riverine UUV Dam Buster

Bushehr, Iran is site of three dams and some of the country's outlaw nuclear (weapons grade) fuel development. The Bushehr nuclear facility and UUVs (unmaned underwater vehicles) are real. A nuclear powered one with a boring (or explosive) head could take out a dam or river intersecting bunker. Nuclear powered UUVs are not under consideration, as far as we know, now.

Sometimes, fictional pictures convey a concept better than words. Submarines are always silent and strange.