Abstract: A horizontal plate freezer (1) for freezing articles inside said horizontal freezer during a freezing process comprising: a plurality of freezer plates (2) forming a stack of freezer plates, where said plurality of freezer plates are arranged substantially horizontal, defining a distance between the freezer plates, where in use articles to be frozen are arranged on one or more freezer plates, where said in stack of freezer plates are arranged between a top frame (3) and a bottom frame (4), where said top frame is arranged at a horizontal level above the stack of freezer plates, and said bottom frame is arranged at a horizontal level underneath the stack of freezer plates, at least one intervention unit (8) with at least one engaging device (10), where the engaging device is arranged moveable in a longitudinal direction along said intervention unit(s), whereby the engaging device is lifted and lowered along said stack of freezer plates, at least one device (6) comprising a first end positioned above a topmost