As sightings of great white sharks around Cape Cod, Massachusetts, increase, one man had an unsettling close encounter with a massive shark while boating recently.

Matt Riley posted a video to Instagram of the close encounter. It shows an enormous great white shark, face scarred, slowly emerging from the water before bumping its face against the side of the boat, mouth open and teeth visible. The behemoth turns around and ominously swims back into the depths.