A young model named Anne hitchhikes her way to a Mediterranean island, hoping for adventure and a change of pace from her routine life. There, she meets Joe, a diver who reveals that he has discovered a sunken treasure off the island's coast. Driven by a mixture of curiosity and greed, Anne decides to join Joe on his treasure hunt. Along the way, they enlist the help of two more individuals: Ernie, an amiable but bumbling tourist, and Manuel, a crafty and somewhat mysterious local. The group sets out on a perilous journey to recover the treasure, facing various challenges both from the sea and from within their newly-formed alliances.

As the expedition unfolds, tensions rise due to conflicting interests and hidden agendas among the group members. The dynamic between Joe and Anne becomes particularly strained as they grapple with trust and mutual suspicion. Meanwhile, an ominous presence looms in their path, threatening to derail their mission entirely. Adventure soon turns into a high-stakes race against time as they navigate treacherous waters and uncertain alliances. The ultimate fate of their treasure hunt remains uncertain as unforeseen dangers emerge, pushing each character to their limits and leaving the outcome hanging in the balance.