frames and concrete bathtubs were also subject to conservation, together with metal barrack equipment. Secondary and accidental wall fillings in the gas chamber building were replaced with historical bricks inserted in mortar in the color differentiating from the original. Horizontal insulation of walls was performed following the injection method and scratched components were reinforced with metal tie-beams.
The connector between barrack number 41 and the gas chamber bunker was probably erected in the late 1940s from components remaining after the deconstruction of other barracks, which would make it look like an integral part of the facility dating back to the period of camp operations (similarly to chamber roofing). In order to emphasize secondary character of this structure, a new connector was performed. Brick foundation was replaced with the concrete structure and timber wall panelling was performed horizontally, painted in black. An extension was performed analogically, with air heating stove exposed inside it.
Wheelchair ramps and platforms constitute the complementation of the abovementioned works. They facilitate the access to the interior, expose its historical flooring and protect the surface within the visit route.
The performance of renovation works influences not only preservation condition of the facilities, but also creates the opportunity to obtain new movable historical objects. Deconstruction of facility components together with the performed excavations have revealed the items hidden from human sight for years. In the case of barrack number 42, the most interesting discovery was constituted by an oval holy medal with the portrait of Virgin Mary with the Infant Jesus on one side and of Jesus with Joseph on the other, hidden in a crack in concrete flooring of the shower section, cast from a tin alloy. The renovation of barrack number 42 enriched museum collections with 38 new movable objects. When it comes to the renovation of barrack number 41, 88 new items were discovered. They include among others structural beams with carpentry markings, metal building equipment components, bricks, a wheel from the little railway car, a Mauser pistol cartridge, a Mosin rifle case and three fragments of paper sheets with the text in Hebrew written on them. What is more, there is a group of 30 personal items: steel keys, combs, a fragment of glasses frame, buttons, a lid of aspirin box, a German 10 Pfennigs coin from the year 1942 as well as a Polish 5 grosz coin from 1936, a steel table spoon, cooking pots, 0.5 l and 0.25 l bottles and two pharmaceutical bottles. Two items of gold jewellery discovered within the site represent high value not only from the historical point of view.
Even if the main objective of renovation works is to stop destruction, repair the defects and secure the objects from further damage, they also make it possible to open the buildings for as wide group of visitors as possible. It is carried out not only through limiting architectural barriers, but also by educating to what extent the objects have remained untouched, which is proved by visual and material differentiation between original and secondary elements introduced into the facilities during the works. What is more, the studies and discoveries made are the source of new information both about the facility itself, as well as about the objects hidden there, being the witnesses of past events and carriers of historical and emotional values.