. >> mandy got close with her co-star claire holt, these two play sisters vacationing in mexico, who50 feet at the bottom of the ocean, surrounded by sharks and running out of oxygen. think "jaws" meets "the shallows." movie takes place under water, but neither had experience. >> we spent a solid eight weeks, eight hours a day under water. >> shot back in 2015, the ladies spent the first four weeks shooting in a tank built outside of london. >> being at the bottom of this tank every day and spending that much energy. i don't think either of us were really prepared for, you know, surfacing at lunchtime and being that tired. we both like collapsed. >> yeah. >> i've never slept so well. >> to make the water look murky, each day the crew would blend up truckloads of broccoli and sprinkle it into the tank. >> i'm stuck! zwl after those great whites -- no actual sharks were used. so, while shooting scenes a diver would swim around wearing a plastic shark head. the cast also spent six weeks shooting on location in the dominican republic at a massive 65,000-square-foot outdoor tank. >> are y

mandy moore and claire holt risked their lives in 47 meters down. >> remember faster you breathe ther you use up your air you will in the want to come backup. >> reporter: moore says actresses bonded through this >> i'm proud to be part of the film with these two,strong, sort ultimately make these life or themselves and save their family members their sister. empowering. >> reporter: really scary. >> what is interesting in this film when i'm hunting sharks, sharks are hunting us. >> holt confirms sharks are not the only threat down there >> what would you do you if you were trapped at bottom of the ocean, no where to go, no ability to contact anyone and you cannot go up. it is a terrifying prospect. >> reporter: while actors who stayed on the surface appreciate its beauty. >> it is terrifying for the first time you put on that mask and go beneath water and then it becomes incredible. >> great thing for people to do to go appreciate the beauty and preciousness of the ocean. >> it is amazing. >> it takes your breath away. >> reporter: pair who sank to the bottom have a different perspe

(nat) finally, mandy moore and claire holt find themselves "47 meters down."rk-cage thriller is tracking to gobble up no more than six-million dollars in its opening weekend. in hollywood, i'm david daniel. the heat goes right on through the weekend. a look at how you will be impacted after the break. ( averi ) still ahead.. a major heat wave hits the bay area. i have a live report. after the break. ♪ ♪ isaac hou has mastered gravity defying moves to amaze his audience. great show. here you go. now he's added a new routine. making depositing a check seem so effortless. easy to use chase technology, for whatever you're trying to master. isaac, are you ready? yeah. chase. so you can. ( marty ) we recorded a video of the sunrise this morning. hot weather expected across the bay area today. ( marty ) here's a live look at temps right now this morning... as you can see it's going to be a hot one. a heat advisory is in effect for the bay area. for more here is dave spahr. ( marty ) here is dave spahr with the weather. (dave)very warm to hot weather is forecast inlan

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this movie is also rated "r". ( mark ) finally, mandy moore and claire holt star in "47 meters down."ller about sisters who go diving in shark infested waters. it's rated pg-13. (mark) ahead at eight on the kron 4 morning news... we're following breaking news.... president trump has confirmed he is being investigated by a special counsel. we'll have the new details. plus... police are having trouble finding a motive in the shooting at a u-p-s center in san francisco. we'll hear from people who knew the gunman. and get ready for hot weather all over the bay area. james fletcher has details on how long it's going to last. this is a story about mail and packages. and it's also a story about people and while we make more e-commerce deliveries to homes than anyone else in the country, we never forget... that your business is our business the united states postal service. priority: you at enterprise, we guarantee it. next vehicle purchase? head to your neighborhood enterprise car sales and let the people who buy more vehicles than anyone... change your thinking about buying your next one. (

(nat) finally, mandy moore and claire holt find themselves "47 meters down."rk-cage thriller is tracking to gobble up no more than six-million dollars in its opening weekend. in hollywood, i'm david daniel. ( mark ) coming up in the next hour... we are following breaking news out of the east bay. a deadly stabbing in oakland. we will have the details just into the newsroom. and if you are thinking about having french fries for lunch ... you might want to reconsider. the new health risks associated with certain types of potatoes. and a rare moment of bipartisan cooperation in washington d-c. how members of congress are trying to use a tragedy to unite the country. (dog) mmm. this new beneful grain free is so healthy... oh! farm-raised chicken! that's good chicken. hm!? here come the accents. blueberries and pumpkin. wow. and spinach! that was my favorite bite so far. (avo) new beneful grain free. out with the grain, in with the farm-raised chicken. healthful. flavorful. beneful. ( averi ) we are learning new details about the man who opened fire at a u-p-s faci

the new thriller, "47 meters down" plays mandy moore and claire holt. >> they go in an underwater cagee. this is everyone's nightmare, when you think, would i swim with sharks? and it happened. what was -- then, like the fact that it's under water. what was it like filmi ining something where you're just under water the whole time? >> exhausting. it was a rigorous shoot. and i think mandy and i had no idea what we had gotten ourselves into. but by the end of it, we had a real affinity for the water, i think. and we got used to it and loved it. but it was tough. it was really tough. >> 90% of this movie takes place under water. that was compelling to us as actors, the physical and emotional challenge of shooting under water. as much as it is about sharks, it's a story of survival. and to me, the scarier premise is being trapped at the bottom of the motion, with a limited amount of air. it's this race against the clock. >> did you have scuba experience before you did this? >> no. >> we had a crash course. >> an afternoon in a swimming pool in los angeles. we did two open-water dives. we