The United Nations Truce Supervision Organization (UNTSO) to engage the services of a qualified contractor specializing in Biological, Chemical and Blast (BCB) systems for the successful completion and execution of a Long-term agreement for the "Preventive maintenance services of containerized bunkers" at OGG, Daascus, Syria. The intent of the project shall be carried out as per the following: - Conduct a comprehensive site visit to inspect the existing BCB Bunker systems at both designated locations and submit a complete inventory report covering mechanical, electrical, HVAC, and NBC filtration systems - Conduct Preventive Semi-Annual maintenance services for the BCB Bunker. - Conduct complete replacement services. Specific Requirements/Information Interested companies are expected to: 1. Be registered in UNGM at level 1 or above. 2. Accept UN Payment Terms (Net 30 days) from submission of invoice and certification by UNTSO.