All from where the fighting in ukraine was taking place, and here s what we saw. on the high alert in the black sea. u.s. navys.e.a.l.s, romanian, strong cooperation, a member of the romanian special forces tells me. it is very important. so all the teams can get on board of the ship and the exact time they should. reporter: these are among nato s most elite units and they allowed us to film on the condition we would not reveal their identities. the raid involves both fast rigid inflatable boats as well as a chopper to land troops on the ship, search it and detain would be enemy combatants. this drill is part of a much larger special forces exercise called trojan footprint, involving some 30 countries, both nato and non-nato allies.