Which three components help to make hatches watertight?

The correct choice focuses on the components specifically designed to ensure a watertight seal in hatches. Dogs, gaskets, and knife edges are all critical in maintaining this seal.

Dogs refer to the locking mechanism that secures the hatch in place. They are typically lever-operated and press the hatch down onto the gasket, creating a tight seal. The force applied by the dogs ensures that even under pressure from water, the hatch remains securely closed.

Gaskets are essential as they provide a flexible barrier between the hatch and the frame. Made from materials like rubber or neoprene, gaskets compress when the hatch is closed, filling any gaps that could allow water to seep in. Their ability to conform to irregular surfaces makes them crucial for ensuring watertight integrity.

Knife edges operate in conjunction with gaskets by providing a sharp edge to compress the gasket against the frame. This design helps to channel water away from the joint where the hatch meets the deck, enhancing the effectiveness of the seal.

Other choices do not accurately reflect components that work together to create a watertight seal. While clamps, seals, and latches have their functions, they do not specifically address the unique requirements for watertight hatches in the same effective manner as the selected components