United Nations Educational, Science and Cultural Organization (UNESCO) hereby invite qualified companies to submit sealed tenders as follows: Under the direct supervision of the UNESCO Antenna in Ukraine and within the framework of the project “Urgent provision of a protective roof for the Transfiguration Cathedral in Odesa”, the contractor shall perform the following works:  Replacement of individual heating point equipment, Replacement of heating system in the upper part of the Cathedral, Replacement of the heating system of the -1st floor (at -3.000), Replacement of heating system -2nd floor (at -6.000), Replacement of heating system of the bell tower, Partial replacement of the boiler house equipment (the block of existing boilers no. 11-20, water treatment and main collector including associated equipment should be replaced), Replacement of the heating main pipes from the boiler house to the Cathedral (heating system heating pipes and cold water supply pipe in a full bore channel).  Duration of the contract: 2 months, at latest until 26 June 2025. A visit to the site is mandatory for the bidders’ eligibility. To register for the site visit, interest must be expressed to [email protected] no later than 14 March 2025, before 17:00 (Kyiv time). Each bidder shall bear the costs of their own visit. The site visit will take place on Monday, 17 March at 13:00 (local time) in Odesa, Soborna Square, 3.