Mumbai, Aug 27 (IANS) Filmmaker Ali Abbas Zafar says he is nervous as well as excited to shoot a "heavy duty climax" sequence for Salman Khan starrer "Tiger Zinda Hai". "Last 22 days to go 'Tiger Zinda Hai', heavy duty climax action to begin from tomorrow. Nervous and excitement," Zafar tweeted on Sunday. The Yash Raj Films (YRF) project is a sequel to 2012 blockbuster "Ek Tha Tiger". It also features actress Katrina Kaif. "Ek Tha Tiger" centered on the life of an agent of RAW (Salman), code-named Tiger, who falls in love with a Pakistani spy from ISI (Katrina) during an investigation and how Tiger's ideology and principles change over time. The makers of "Tiger Zinda Hai" have locked Christmas 2017 for the release of the film. The team of "Tiger Zinda Hai" has shot in scenic locales of Austria and Abu Dhabi. Zafar didn't mention the location where the climax scenes will be shot.