Baywatch (1989)

S9E19 Double Jeopardy

On her way to her grandmother's birthday celebration, Alex's plans take an unexpected turn when she encounters Ben, a diamond runner in peril. His partners, Lisa and Jason, are determined to eliminate him, leading to a tense standoff inside an underwater cave. As the tide begins to rise, Alex and Ben must navigate the looming danger while evading the smugglers patrolling above in their motorboat.