Lords of the Deep (1989)

Humanity's ambition reaches new depths with the establishment of America's inaugural self-sufficient underwater research facility, sparking excitement for a groundbreaking mining venture. However, as the crew delves deeper, they encounter the unforeseen inhabitants of a hidden aquatic realm. Their exploration quickly turns perilous as they confront the unknown dangers lurking in the abyss, challenging both their survival and the very nature of their mission. The thrill of discovery soon transforms into a fight for life against mysterious creatures that threaten their existence beneath the waves.