this is emily and luka scuba diving.mily thinks they're about to take a group picture, but luke has a different plan. holding up a card and on that card it says, i love you. will you marry me? >> a great way for her to, like, use up all her oxygen in her tank. >> what she's doing? underwater. >> she nods, yes. only put it in a shell. put it in a nice little shell. puts it on. and because they're underwater and in scuba diving a thumbs up means to surface, she has to stick with the good old -- so i wanted to find out more, and right this minute we have luke via skype to tell us all about it. >> were you at all concerned she might use up all the oxygen in her tank? because in the video we do see her blowing out quite a bit of air? >> as you look closely, a part where i kind of go like this and telling her, remember your breathing technique. because if you do stop, your lungs explode. so i don't want that to come out of the proposal. >> okay. that was a big, old risk. >> were you thinking about dropping the ring and all the