we were probably half an hour into our trip. >> miles from land, a powerful rogue wave shatters one of the vessel's big windows. >> at that stage, the wave came over and actually hit the front of the boat which, in turn, caused the window to break and the water is coming in. priscilla was sitting there looking at me. and i'm looking at the waves and it was just like, hmm, this is quite scary. >> the couple sends an urgent call for help. it's picked up by the rescue team in new zealand. >> the hotline rang. so, i thought here we go. what we got now? we were told it was a boat in distress and if we could go out and try to find it. >> the mayday calls gives only a vague position. the pilot knows finding the boat will be tough. >> the rescue helicopter actually went over us. it didn't see us because of the squalls in the water. >> it's now a nerve-racking 25 minutes since the rescue call was made. and at any moment, "the tormenter" may sink.