Cleaning device for cleaning an underwater ground-working apparatus and method

A cleaning device for cleaning an underwater ground-working apparatus, the cleaning device comprising:

• an enclosing body which extends substantially from a bottom of a body of water to above a water surface and encloses an inner space, wherein the inner space is configured so that a trench cutter or a drilling unit is movable within the inner space, and
• a separating device, through which in the enclosing body an upper portion of the inner space is configured to be separated off to form a cleaning area, wherein the cleaning area is configured so that the trench cutter or the drilling unit is receivable within the cleaning area, and wherein the cleaning area is configured so that dirt is removable from the trench cutter or the drilling unit,
• wherein the enclosing body has a telescopic portion, with which a length of the enclosing body is configured to be changed, and
• wherein the separating device has at least one pivotably mounted separating flap, which is configured to be pivoted between a side open position and a separating position, in which the at least one pivotably mounted separating flap blocks off an upper cleaning area from a lower inner space of the enclosing body.