The invention relates to an apparatus for sealing off a part of a wall in a section drilled into an earth formation and to be placed in such section, where said apparatus comprises elongate members arranged along a closed curve, where adjacent elongate members are connected via intermediate links, each link being moveable from an unlocked position to a locked position. The system may further provide a list of first documents relating to the search query in a first area of a user interface and provide additional information that has been retrieved from one or more of the first documents in a second area of the user interface. The magazine loader includes a holder adapted for holding ammunition in an array including multiple columns and rows. Input devices placed in the tank may send signals to the PLC, causing the activation or deactivation of certain electromagnets which affects the movements of the fish. In addition, the heat exchanger block is arranged movably in the insulation vessel.