Abstract: A movable platform adjacent to a stationary platform and operable between a raised position forming a part of a deck surface and a lowered position at least partially submerged in the body of water. A landing section and walkway section included in the movable platform. A lever arm carried by the landing section and extending underneath the walkway section, wherein the lever arm engages a bottom side of the walkway section when the movable platform is in the raised position, and the lever arm disengages from the walkway section when the movable platform is in the lowered position. A floatation unit disposed on the bottom side of the landing section. An air pump unit carried by the stationary platform, wherein the air pump unit channels air into and out of the floatation unit to change the buoyancy of the floatation unit to raise and lower the movable platform.

Abstract: A submergible activity platform for attachment to an associated structure on a body of water is disclosed. The activity platform for supporting persons engaged in water activities includes a platform area extending outwardly from and alongside the associated structure. A support structure is carried by the activity platform for mounting the activity platform to the associated structure so that the activity platform is located at a desired depth in the water when mounted to the associated structure. A walkway is included in for providing access between the associated structure and the activity platform when submerged. The activity platform includes a water activity section free of the walkway where water activities may take place. The activity platform also includes a plurality of water flow passages for allowing water to flow through the activity platform when submerged to reduce the force of water currents against the activity platform.