[Zenjitsuman]

Recently Russia showed a drone stealth sub
that could have done the damage.

I am surprised no Freeper mentioned the existence
of the Stealth Sub

[MeganC]

That was a stealth boat and not a sub. It looked a lot like the same stealth boats the South Americans use to smuggle drugs into the USA. That made me wonder if it was just a smuggling boat and not a weapon because it was just too small to do much damage to an actual ship.