Yongary, Monster From The Deep

This cult-classics was Korea's first entry into the kaiju movie genre. After a nuclear test causes a massive earthquake, scientists realize that the quake is the least of their problems - the intense radiation has awakened the legendary reptilian monster, Yongary, who wreaks havoc throughout the country. Martial law is declared and cities are evacuated as scientists race against time to create a refrigerant that may be the only weapon to stop the monster before it destroys the whole country.