Two Air Leaks Detected in Russian Module of the ISS, One Successfully Sealed

• June 5, 2026

During a routine inspection in the Russian segment of the International Space Station (ISS), astronauts identified two air leak sources in the Zvezda service module. The discovery was reported by the Russian space agency Roscosmos and highlighted concerns regarding the station’s internal atmosphere integrity.

Leak Detection and Immediate Response

Upon identifying the air leaks within the transition chamber of the Zvezda module, the onboard crew quickly undertook measures to address the problem. One of the leaks was sealed using a two-component sealing compound known as Germetall-1. This initial repair involved applying the first layer of the hermetic material to restore airtightness and maintain the station’s environmental stability.

Monitoring the module’s atmosphere is critical for preserving the safe living and working conditions for astronauts aboard the ISS. Even minor breaches can pose long-term risks if not addressed promptly. The application of Germetall-1 reflects the satellite crew’s preparedness and the availability of specialized materials for in-orbit maintenance.

At this stage, information about the status of the second leak or any further steps to manage it has not been disclosed. The discovery underscores the ongoing challenges of maintaining airtight integrity on a complex structure operating in the harsh conditions of space. Routine inspections remain a key part of the station’s safety protocols, enabling early detection and mitigation of potential hazards before they escalate.

This event draws attention to the robust collaboration and technical expertise required to support the ISS, a multi-national orbital laboratory that continues to provide critical data for scientific and exploratory endeavors. Roscosmos and partnering space agencies routinely share updates on station operations and maintenance activities to ensure mission continuity and crew safety.

The swift response to the air leaks in the Zvezda module exemplifies the active role of cosmonauts in handling unexpected situations, contributing to the ongoing success of the ISS program as it advances human presence in low Earth orbit.

Astronauts discovered two air leaks in the Russian segment of the ISS; one has been repaired using a two-component sealing compound.