Abstract: An improved diver's boarding ladder and dive door for a boat having a dive opening. The boarding ladder is positionable between a boarding position and a storage position without having to be removed and stored. In the boarding position, the dive opening is opened and the boarding ladder extends below the waterline to assist swimmers and divers in boarding the boat from the water. In the storage position, the dive door closes the dive opening and the boarding ladder is stored out of the way inside the boat's hull in an inverted position. The boarding ladder is secured in the dive opening with a hinge that runs along the entire length of the bottom of the dive opening and acts as a chafe plate to prevent damage to the boat's hull from dive equipment.