What is the United Nations Appeals Tribunal?
The United Nations Appeals Tribunal (UNAT) is the second and final tier of the International Seabed Authority’s (ISA) two-tier internal justice system.
Who can appeal?
Current and former ISA staff members may appeal a judgment of the Joint Appeals Board (JAB) to UNAT in accordance with Article XI of the ISA Staff Regulation and Staff Rule 11.3.
Legal basis for UNAT’s jurisdiction
Under Article 2(10) of the UNAT Statute, UNAT may hear and decide applications filed by staff members of specialized agencies or other international organizations if the organization has concluded a special agreement with the UN Secretary-General.
UNAT’s jurisdiction over ISA staff members is based on a special agreement concluded between the United Nations and the International Seabed Authority in February 2010. This agreement extended UNAT’s competence to the Authority.
Judgments
2026
| Case Name | Judgement reference |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | 2026-UNAT-1633
|
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | 2026-UNAT-1679 |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | 2026-UNAT-1680 |
| Giovanni Ardito, Jonathan Hall, Khalilah Hackman and David Pusztai v. Secretary-General of the International Seabed Authority | 2026-UNAT-1681 |
2025
| Case Name | Judgement reference |
| Jonathan Hall v. Secretary-General of the International Seabed Authority | 2025-UNAT-1580 (p).pdf |
| Sheldon Heron Carter v. Secretary-General of the International Seabed Authority | 2025-UNAT-1593 |
| Giovanni Ardito and David Pusztai v. Secretary-General of the International Seabed Authority | 2025-UNAT-1603 |
2023
| Case Name | Judgement Reference |
| Van Khanh Nguyen v. Secretary-General of the International Seabed Authority | 2023-UNAT-1347 |
| Andrew Webster v. Secretary-General of the International Seabed Authority | 2023-UNAT-1369 |
2022
| Case Name | Judgement Reference |
| Andrew Webster v. Secretary-General of the International Seabed Authority | 2022-UNAT-1192 |
2021
| Case Name | Judgment Reference |
| Van Khanh Nguyen v. Secretary-General of the International Seabed Authority | 2021-UNAT-1089 |
2020
| Case Name | Judgement Reference |
| Andrew Webster v. Secretary-General of the International Seabed Authority | 2020-UNAT-983 |
Orders
2026
| Case Name | Order Reference |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No.686 (2026) |
| Giovanni Ardito, Jonathan Hall, Khalilah Hackman and David Pusztai v. Secretary-General of the International Seabed Authority | Order No 682 (2026) |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No. 681 |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No.680 (2026) |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No. 675 (2026) |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No. 674 (2026) |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No.666 (2026) |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No. 637 (2026) |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No. 636 (2026) |
2025
| Case Name | Order Reference
|
| Giovanni Ardito and David Pusztai v. Secretary-General of the International Seabed Authority | Order No. 611 (2025) |
| Jonathan Hall v. Secretary-General of the International Seabed Authority | Order No. 601 Corr.1 (2025) |
| Marie Bourrel-McKinnon v. Secretary-General of the International Seabed Authority | Order No. 592 (2025) |
| Jonathan Hall, Khalilah Hackman and Giovanni Ardito v. Secretary-General of the International Seabed Authority | Order No. 591 (2025) |
2020
| Case Name | Order Reference
|
| Andrew Webster v. Secretary-General of the Seabed Authority | Order No. 368 (2020) |
2018
| Case Name | Order Reference
|
| Andrew Webster v. Secretary-General of the International Seabed Authority | Order No.328 (2018) |