System for pulling apart a tube, which tube has an inner wall, an outer wall, a longitudinal direction, a first end, a second end, a middle zone, a first zone and a second zone, wherein the first zone extends from the middle zone to said first end and the second zone extends from the middle zone to said second end, the system comprising: - a first retaining member which is provided for insertion into the first zone via the first end; - a second retaining member provided for insertion into the second zone via the second end, each retaining member being adjustable between a first position in which the retaining member fits inside the tube and a second position in which, in use, the retaining member exerts a pressure on the inner wall of the tube; and - actuation means configured to: - insert the retaining members in their first position into their respective zone of the tube; - subsequently bring the retaining members into their second position so that they exert a pressure on the inner wall of the tube to obtain a temporary fixed connection between a retaining member and its respective zone; and - then move the retaining members away from each other to move the first zone and the second zone of the tube away from each other, characterized in that the actuation means are configured to insert the first retaining member in the first zone of the tube as close as possible to the middle zone and insert the second retaining member in the second zone of the tube as close as possible to the middle zone, and in that moving the retaining members away from each other to move the first zone and the second zone of the tube away from each other narrows the middle zone. - a first retaining member which is provided for insertion into the first zone via the first end; - a second retaining member provided for insertion into the second zone via the second end, each retaining member being adjustable between a first position in which the retaining member fits inside the tube and a second position in which, in use, the retaining member exerts a pressure on the inner wall of the tube; and - actuation means configured to: - insert the retaining members in their first position into their respective zone of the tube; - subsequently bring the retaining members into their second position so that they exert a pressure on the inner wall of the tube to obtain a temporary fixed connection between a retaining member and its respective zone; and - then move the retaining members away from each other to move the first zone and the second zone of the tube away from each other, characterized in that the actuation means are configured to insert the first retaining member in the first zone of the tube as close as possible to the middle zone and insert the second retaining member in the second zone of the tube as close as possible to the middle zone, and in that moving the retaining members away from each other to move the first zone and the second zone of the tube away from each other narrows the middle zone. - insert the retaining members in their first position into their respective zone of the tube; - subsequently bring the retaining members into their second position so that they exert a pressure on the inner wall of the tube to obtain a temporary fixed connection between a retaining member and its respective zone; and - then move the retaining members away from each other to move the first zone and the second zone of the tube away from each other,