alexiaaron alexis shot and kill2 people before being killed by police. >>> iran's newly elected president hassan rouhani is expected to make appearance in hopes of possible break in negotiations over iran's nuclear program. you can follow top stories at our website at www.aljazeera.com. stay with us, >> are you guys ready? in the event of any emergency, let us know through coms. >> high above the artic circle, >> stand by.... >> in some of the world's coldest waters, canadian military divers are preparing for a search and rescue training mission. >> the bottom is about 40 meters, 120 feet down, the water is about 2 degrees below zero celsius. they can stay down there 40 minutes to an hour without really getting too cold. >> yellow diver well, yellow diver well for leaks. >> lately, the arctic has been seeing a flurry activity. that's because there's something locked beneath the ice. thirteen percent of the world's undiscovered oil and 30 percent of its untapped natural gas. trillions of dollars of potential profit. and that means that here in the far north, issues of sovereignty security,