A load handling system for submerging of load from a water surface to a position situated under a connected installation vessel, the load handling system comprises • a submergible load support for support of the load to be submerged, which submergible load support comprises a ballast system, characterized in that the load handling system further comprises a controllable pendulum system (8,9) comprising • a first rigid pendulum device which comprises o a first end (8a,8b) which is pivotably connected to the submergible load support and o a second end (8c,8d) which is connectable to the installation vessel in a first pivot joint, and • a second rigid pendulum device, oriented parallel to the first pendulum device, which comprises o a first end (9a,9b) which is pivotably connected to the submergible load support and o a second end (9c,9d) which is connectable to the installation vessel in a second pivot joint, the first end (8a,8b) of the first rigid pendulum device and the first end (9a,9b) of the second rigid pendulum device are situated symmetrical, or close to symmetrical, around a centered vertical plane through the load support in a direction parallel to the pendulum devices (8,9) and in that the sizes and the connecting positions of the pendulum system (8,9) allows for controllable pendulum movement of the load support between • a first position situated at the water surface at the installation vessel and • a second position situated below the installation vessel, when the load handling system is pivotably connected to the vessel, and wherein the load handling system further is configured such that an initial orientation of the peripheral surfaces (6a,6b,6c) of the load support, relative to the water surface, is kept constant, or close to constant, at least during said pendulum movement. • a submergible load support for support of the load to be submerged, which submergible load support comprises a ballast system, • a first rigid pendulum device which comprises o a first end (8a,8b) which is pivotably connected to the submergible load support and o a second end (8c,8d) which is connectable to the installation vessel in a first pivot joint, and o a first end (8a,8b) which is pivotably connected to the submergible load support and o a second end (8c,8d) which is connectable to the installation vessel in a first pivot joint, and • a second rigid pendulum device, oriented parallel to the first pendulum device, which comprises o a first end (9a,9b) which is pivotably connected to the submergible load support and o a second end (9c,9d) which is connectable to the installation vessel in a second pivot joint, the first end (8a,8b) of the first rigid pendulum device and the first end (9a,9b) of the second rigid pendulum device are situated symmetrical, or close to symmetrical, around a centered vertical plane through the load support in a direction parallel to the pendulum devices (8,9) and in that the sizes and the connecting positions of the pendulum system (8,9) allows for controllable pendulum movement of the load support between o a first end (9a,9b) which is pivotably connected to the submergible load support and o a second end (9c,9d) which is connectable to the installation vessel in a second pivot joint, • a first position situated at the water surface at the installation vessel and • a second position situated below the installation vessel,