Shaft seals are used to prevent water from entering the ship’s hull through the propeller shaft. They are typically made of rubber or metal and are installed in the stern tube, which is the passage that the propeller shaft passes through.

Bund seals are used to prevent water from entering the ship’s hull through the openings in the hull, such as the doors and hatches. They are typically made of rubber or neoprene and are installed around the openings.

Both shaft seals and bund seals are essential for keeping ships watertight and preventing flooding.

The term “ship seals” can also refer to a specific type of ship, called a sealer. A sealer is a small, fast ship that is used to hunt seals.