Mountain Shark (2024) on Netflix

Plot summary

In England's Lake District stands a secret weapons base, neglected for years and run by a small staff of scientists and military. Funding has been cut and the site is near closure. The scientists pack up the work of years, some sad to leave the cold, remote place, others glad to go. Dark myths and legends surround past experiments, and little remains of the base's importance in the great wars. A group of elite hunters is recruited to the base and sent straight into the mountains around it on a mission.