Abstract: The invention relates to an intervention module (18) for well intervention operations in preferably a pressurized subsea well (2) with a wellhead (4) disposed on a water floor. The intervention module (18) is provided with necessary equipment to replace, under water, intervention tools (54) and thereby perform several well intervention operations in one run, without the supply of equipment from a surface vessel. The module (18) is lowered from a surface vessel and placed on the wellhead (4), possibly a BOP (12), of the well (2). The intervention module (18) is connected to the surface vessel through a connecting line/hose or a wireless connection which communicates, as a minimum, necessary control and feed-back signals. The module (18) is provided with i.e.