An arrangement for positioning a fall pipe end (414) during subsea rock installation includes a submersible frame (400) adapted to be lowered towards an underwater structure. The submersible frame has a first (401) frame structure carrying propulsion equipment (415) and a second frame structure (402) carrying survey equipment (406, 407), a channel structure (410), and a rotation system with an actuator (403). The actuator (403) has a first (411) and a second element (412) and being adapted to convert an energy input into a rotation of the second element (412) when holding the first element (411). The second element (412) is connected to the second frame structure (402), such that in suspended condition of the submersible frame (400), the survey equipment (406, 407) can be rotated about a vertical axis (409) by energizing the actuator (403), without using the propulsion equipment (415).

An arrangement for positioning a fall pipe end (414) during subsea rock installation includes a submersible frame (400) adapted to be lowered towards an underwater structure. The submersible frame has a first (401) frame structure carrying propulsion equipment (415) and a second frame structure (402) carrying survey equipment (406, 407), a channel structure (410), and a rotation system with an actuator (403). The actuator (403) has a first (411) and a second element (412) and being adapted to convert an energy input into a rotation of the second element (412) when holding the first element (411). The second element (412) is connected to the second frame structure (402), such that in suspended condition of the submersible frame (400), the survey equipment (406, 407) can be rotated about a vertical axis (409) by energizing the actuator (403), without using the propulsion equipment (415).