I know it's unlikely they'd go off from that *if* they were present, but it would still be bad news. In any case, I don't think the russians would be very keen in explaining why their missile boat imitated a dirty bomb.
Salvaging a boat is not easy, and I don't know how deep it is there. But as I said it's just what I read, I sincerely doubt it but then again it does fit with a rapid abandoning of the ship and disposing it in deeper water.