Breakwater.

Aslan, a young insecure fisherman who lives on a Turkish island, finds a valuable lobster cave while diving. Knowing this treasure will bring him wealth and the prestige that he has never had in his society, he decides to keep it a secret from his cousin and best friend Yilmaz until he can properly harvest the lobsters by himself. By not sharing the secret, Yilmaz's growing suspicion conjures a series of paranoid obsessions that thrust him into a downward spiral.