on the way back, alvydas passes a lithuanian coast guard vessel.they have been patrolling frequently these past weeks. but alvydas isn't worried about russian provocations, or even attacks. >> why would i be scared? we have been friends all these years. i still have many acquaintances over there in kaliningrad. >> has the war in ukraine changed anything? >> all of here used to be friends. but things turned out differently. i guess there is nothing you can do. >> as alvydas heads back to land, the students are about to begin their final exercise: making a fire. then, all participants get a certificate. justina completed all exercises. and is eager to learn more. >> i think it's important to be prepared for crises. i now know i can pitch a tent in case of an emergency. we're brave kids. many in my generation will sign up for military service. >> lithuania scrapped compulsory military service but re-introduced it in 2015, after russian annexed crimea. once these students have finished school, many will probably join the army. >> for decades, denmark w