While a menacing typhoon approaches, an accident at the giant natural gas plant Regalia occurs. Japan Coast Guard rescue divers Daisuke Senzaki, Tetsuya Yoshioka and engineer Hiroshiichirou Sakuragi head together to the gas plant. During their rescue efforts an explosion occurs that traps Daisuke, Natsu Nishizawa Kazue Fukiishi and worker Hisayoneo Kizima. Daisuke then looks for a way out for his party with a man he just meets Takuya Hotori. Because of
