Amendment No.1 With reference to the Request for Proposal (RFP) dated 27 March 2026, IMO wishes to issue an amendment to: a) Extend RFP Deadline: The deadline for submission to the RFP has been extended to Monday 27 April 2026 (12:00 hrs, UK Time), instead of Monday 20 April 2026, (12:00 hrs, UK Time), b) Amend Clause 3.2.3 and 4.1.2 b of the Terms of Reference. Please refer to the document titled “3. Revised Annex C – TOR Environmental Risk Impact Assessment – Costa Rica)”. Prospective bidders are advised to review the revised TOR carefully and ensure that their proposals are submitted in line with the updated requirements ------------------------------------------------------------------------------------------------------------------- 1. The International Maritime Organization (IMO) seeks proposals for “ENVIRONMENTAL RISK IMPACT ASSESSMENT ON UNDERWATER RADIATED NOISE (URN) FROM SHIPPING ACTIVITIES IN COSTA RICA” in accordance with the requirements, terms and conditions stipulated herein. 2. This Request for Proposal (RFP) consists of this document and the following annexes: Annex A: Instruction to Bidders Annex B: IMO General Contract Conditions-Services https://wwwcdn.imo.org/localresources/en/About/Procurement/Documents/IMO%20General%20condition%20Services.pdf Annex C: Terms of Reference Annex C.1: Technical Response Form Annex D: Financial Response Form Annex E: Vendor Registration Form https://www.imo.org/en/About/Procurement/Pages/Vendor-registration.aspx 3. In submitting a proposal, the bidder accepts in full and without restriction the requirements of this RFP including the Terms of Reference and the IMO General Conditions Services as the sole basis of this tender process, and waives his own conditions of sale, whatever they may be. Bidders should not submit a proposal if they are unable to accept the IMO Terms and Conditions, as per Annex B. 4. Proposals must be received by the IMO no later than 20 April 2026, 12:00 hours (UK Time). Proposals received after the designated time will be automatically rejected. Proposals are to be transmitted online via the IMO procurement portal. Submission of proposals by other means is not accepted. Note: Due to specific operational requirements and the nature of the services to be provided, participation in this tender is restricted to entities that are legally registered in Costa Rica and meet all applicable tender qualification and technical requirements.