Being involved in the building of Type 214 diesel/electric/AIP (air independent propulsion) boats for Greece and South Korea, and having served on Disel boats and Nukes in the Pusser, I would not want to be in a Nuke if one of these boats (which can stay over 14 days submerged)was in the area. They are 100% silent and all we can hope is that we always stay friends with Greece and South Korea who are also building them under licence at Hyundai shipyard in Ulsan.