CTBTO

#CTBTO seismoacoustic engineer Gregory Brenn and the engineering team from the University of Alaska Fairbanks, supported by crew from the S/V Pelagic 77 Amundsen, managed the challenging voyage through the Drake Passage to install the final infrasound station on Antarctica, and what will be the last of the 39 facilities in the United States. And they did it in just 20 days. 🚢 Despite variable weather, brash ice, and curious wildlife 🐧, the team worked tirelessly to install the first four elements before the Antarctic winter sets in. With #infrasound data now flowing to the #IDC 📡 for testing we hope IS54 will soon join certified stations AS106 and RN73 at Palmer Station and play a critical role in enhancing nuclear test explosion detection capabilities for years to come. Sincere thanks to #USA, @doddtra and @uafairbanks

Today in Vienna, #CTBTO and #CôtedIvoire signed a Facility Agreement. The agreement formalizes cooperation and allows the International Monitoring System (IMS) stations in the country to contribute to the IMS network, supporting the Treaty’s verification framework. Learn more about the Facility Agreement 👉ctbto.info/4rZVMZr

New Permanent Representative of Malta, H.E. Ms Francesca Camilleri Vettiger (@FrancescaCV_MT), presented her credentials to @DrRobFloyd today. The Executive Secretary warmly welcomed her to Vienna, thanked Malta for its steadfast support for the #CTBT, and looked forward to strengthening cooperation in advancing the Treaty's goals.

Acaba de concluir en Viena el 66º período de sesiones del Grupo de Trabajo B de la @CTBTO con consenso sobre el informe del grupo. España reafirma su compromiso con un mundo libre de ensayos nucleares basado en el Sistema de Vigilancia Internacional. 🌍🔬#CTBTO #EspañaenlaONU

15 experts funded under the 2026 Technical Experts Support Programme (TESP) attended WGB-66 in Vienna, met with the WGB Chairperson, and visited the IDC Operations Centre and radionuclide filter archive at the VIC. Since 2006, TESP has supported 100+ experts from nearly 60 States. The programme is made possible thanks to the generous support of States Signatories and institutional donors. We are grateful in particular for the continued support of the European Union and its Delegation to the International Organisations in Vienna

Some International Monitoring System (IMS) station operators work under truly challenging conditions. AS92 in Yuzhno-Sakhalinsk, the last certified facility of the Russian IMS segment, reflects the dedication and professionalism behind this network. Often operating in remote and demanding environments, these teams play a vital role in ensuring the continuity and reliability of monitoring data.

Engaging discussions with officials and experts from a range of countries on heightened global interest in a strong #CTBT at the Moscow Nonproliferation Conference. Filled with hope after the meeting with Next Generation participants so keen to shape this world for the better.

Early-career #WomenInSTEM: applications are open! Through the #CTBTO Mentoring Programme, you’ll work one-on-one with experts from our tech Divisions, take part in seminars & join a 🌍 network contributing to the effort to end nuclear test explosions. 🔗ctbto.info/MentoringProgr…

Productive discussion with Foreign Minister Sergey Lavrov on cooperation between the CTBTO and the Russian Federation. Russia continues to play an active role in supporting the CTBT and contributes 32 facilities to the CTBTO’s International Monitoring System.

Congratulations to @VCDNP on 15 years of outstanding contributions to advancing nuclear non-proliferation and disarmament and on another successful diplomatic workshop in Vienna. I was honoured to join Minister, Ambassadors, experts and IOs to discuss strengthening multilateral diplomacy and nuclear governance for a more peaceful and secure world. My sincere thanks to @BMeinl and @MFA_Austria for hosting yesterday’s celebratory reception.

On 11 March, we mark 15 yrs since the earthquake & tsunami in Japan led to the Fukushima Daiichi nuclear accident. CTBTO provided data on anthropogenic radioactivity to Member States, demonstrating the broader value of its monitoring system. Learn more ➡️ ctbto.info/nuclearemergen…

66th session of the Working Group B (WGB) of the Comprehensive Nuclear-Test-Ban Treaty Organization started its work on 9 March. 🇹🇷 is pleased to contribute to key technical discussions on @CTBTO’s verification regime. @LeventEler @ScienceOzel @Kandilli_info

Africa’s leadership has been vital in building the global norm against nuclear test explosions. At an event marking 30 years of the #CTBT in Africa, @DrRobFloyd highlighted the region’s commitment, expertise and contribution to the verification regime. “The turning point – from over 2,000 nuclear test explosions in 50 years to less than a dozen since 1996 – was not possible without Africa.” One Treaty. One Goal. Zero Tests. 🌍

Hoy comienza el Grupo de Trabajo B de la Organización del Tratado para la prohibición completa de ensayos nucleares en ONU en Viena🌍🇺🇳. 🇪🇸 ha reafirmado su compromiso con la entrada en vigor del Tratado con el fin de conseguir un mundo libre de ensayos nucleares. @CTBTO

🇧🇪 and its experts are looking forward to a productive session of Working Group B. Reliable data and transparency are essential in upholding the CTBT’s verification regime.

Proud to support the #CTBTO She Shapes Science initiative to advance expertise, enhance knowledge sharing and expand professional networks for mid-career women from National Data Centres

She Shapes Science is now open for applications! This hybrid fellowship is designed for women in National Data Centres, combining bootcamps & joint technical work on real-world uses of CTBTO verification tech. Supported by @ItalyUN_Vienna 🇮🇹. ➡️ ctbto.info/SSSApplication

During the opening of the 66th session of Working Group B, @DrRobFloyd looked ahead to the work still to come. “Even as the world faces turmoil, or perhaps because it does, we must continue to affirm, preserve and build on every achievement.”  As the #CTBT marks its 30th anniversary year, the commitment to strengthen verification and cooperation remains as important as ever.

Women play a vital role across the #CTBTO from science to policy. This International Women’s Day, learn more about initiatives like our Mentoring Programme and She Shapes Science fellowship that #GiveToGain and promote opportunities for women across our work. #IWD2026 ctbto.info/Diversity

Grateful for the opportunity to speak at the @VCDNP–@JamesMartinCNS Workshop on the #NPT and to meet H.E. Amb. Đỗ Hùng Việt of Vietnam, President-designate of the 11th NPT Review Conference, to discuss our shared commitment to global nuclear non-proliferation and disarmament, and the importance of the #CTBT