i'm alex stewart. hari sreenivasan is off. >>> last month america's leading power took a deal with iran. now the fall between iran and the west appears to be continuing. today for the first time in years iran allowed international inspectors to visit a key nuclear site where a reactor to produce heavy water is under construction. heavy water can be used to make plutonium for a nuclear weapon. in a speech today iranian president sought to reaassure hard liners in his country that last month's deal is already benefitting iran. >> translator: cruel sanctions against the islamic republic has caused recessions in the economy. the first phase in talks has led to economic successes. >> israeli president was asked if he would be willing to meet with rouhani. >> why not? i don't have enemies. we don't consider iran as an enemy. >> yesterday president obama down played expectations of a bigger long-term deal with iran regarding its nuclear program but says negotiations are worth the effort. >> we have to not con

. >> alex stewart, an experienced rescue diver, is lowered from the chopper. >> when they placed me onhe boat, i had about two seconds and i was off it. >> alex knows there's very little time. >> i shouted to tina to get into the water and for her husband to go in the dinghy and get away from the seng sinking boat. >> tina doesn't want to get in the water for fear she'll lose hold of priscilla. then a wave hits the cockpit and the dog falls in to the ocean. she sees alex and paddles toward him. >> we were out in the middle of the ocean. how did this dog get here? here's an added problem to the situation. >> alex's first priority is rescuing tina and paul. he swims with priscilla back to the boat and focuses on tina. meanwhile priscilla is fighting her own battle with the waves. on his third attempt, alex gets the harness around tina and they hoist her up. >> once i started to be lifted i thought this is great. this is my rescue. >> by now, the boat is nearly under water entirely. and the dog is nowhere in sight. paul is bleeding badly from a cut on his arm as alex secures his hoist up.