Israel's Nuclear Armed SSG

It looks like it's designed to sit on the sea floor

It's the Dolphin II class submarine, and in addition to being really ugly, it has 10 torpedo tubes, 6 of the standard 21 inch (533 mm) size, and 4 with a 26 inch (650 mm) tubes.

The obvious question is why the Dolphin II might need larger tubes, and the obvious answer is that it is used to launch the Popeye Turbo submarine launched cruise missle, which is alleged to have a 1500 km range, though it could also be used to deploy relatively large mines

As such, this constitutes a fairly formidable 2^nd strike capability with nuclear weapons, along with the ability to launch conventional strikes at a fairly long range.

When combined with its AIP (Air Independent Propulsion) system, which uses liquid oxygen and methanol reacted into hydrogen, which can allow for the boat to remain submerged for up to a month.

Of course, this assumes that Israel has nuclear weapons, but this assumes that Israel has nuclear weapons, which it neither conforms nor denies.  (Yeah.right)