It wouldn’t surprise me. If we get nuked it will be by ship. Plenty of ship yards where a ship could go in for repairs. The weapon would be placed on board and concealed. Maybe one or two of the crew might know. Ship would resume work. At some point it would pick up cargo destined for NY/NJ. Weapon is detonated on the Hudson. Nothing unusual would give the plot away until it was too late.
Don’t think so...a nuke would only be effective if launched from a ship and detonated in the air...just like the missile that took out that passenger jet over long island some years ago.