What went into that underwater kissing scene

If you have watched the trailer of 'Raabta', you would know that there is this kissing scene wherein the lead pair Sushant Singh Rajput and Kriti Sanon are seen kissing underwater.  

It turns out that they didn't know swimming beforehand.  Both Kriti and Sushant took rigorous underwater training sessions in order to shoot the underwater bits in the film right. Taking two weeks off, they solely dedicated their time to these sessions, so that they could perform with conviction when their director called action! 

"The underwater sequences in the film needed me to be absolutely calm and comfortable while performing. As an actor it’s very important to not have any parallel thoughts or fears while playing a character. Two weeks of swimming and scuba sessions eased me out. I still don’t love being under water but I am not scared anymore," Kriti, who starred in '1: Nenokkadine', says.  

Directed by Dinesh Vijan and produced by Dinesh Vijan, Homi Adajania and Bhushan Kumar, Raabta stars Sushant Singh Rajput and Kriti Sanon in the lead and is slated to release on June 9.