Simu Liu, star of the movie “Last Breath,” trained extensively as a saturation diver for his role. He learned that saturation diving is more challenging than typical scuba diving and involves specialized equipment. Liu expressed excitement about the unique preparation, which he described as fulfilling and life-changing. He was captivated by the real-life story of saturation divers who work under demanding conditions and saw his role as a chance to convey an inspiring tale of survival and teamwork.