NASA names astronaut who suffered life-threatening emergency that triggered historic space evacuation

NASA has revealed new details about a rare medical evacuation from the International Space Station (ISS) last month.

The agency confirmed Wednesday that 58-year-old astronaut Mike Fincke suffered the medical issue that caused Crew-11’s mission to end a month early.

Fincke declined to share details about his condition or current health but praised his colleagues and medical team for their ‘professionalism and dedication’ and said their efforts ‘enabled a positive outcome’.

According to Fincke, after further evaluation, NASA determined that an early, carefully coordinated return that would allow the crew to access advanced medical imaging not available on the space station was the safest option and not an emergency.

NASA administrator Jared Isaacman said last month that the decision was made out of caution, noting that the astronaut’s medical condition was considered “serious” and would require additional care on Earth.

Crew-11, which included Roscosmos cosmonaut Oleg Platonov, NASA astronaut Zena Cardman, and Japan Aerospace Exploration Agency (JAXA) astronaut Kimiya Yui, splashed down off the coast of San Diego, California, on January 15.

“I am doing very well and continuing standard post-flight refurbishment at NASA’s Johnson Space Center in Houston,” Fincke said.

‘Space flight is an incredible privilege and a reminder of how human we are. Thank you all for your support.

This was the first time a crew member’s mission on the ISS ended early for medical reasons.

Crew-11 arrived at the ISS on August 1, 2025, meaning their return date is planned for late February.

The four astronauts were ready to leave after Crew-12 arrived on a new SpaceX Dragon capsule as early as February 15. However, the Crew-12 mission launched to the ISS on February 13.

While NASA did not provide details about the medical emergency, Fincke did provide a clue during Crew-11’s first public appearance since returning to Earth.

He said a portable ultrasound machine was ‘super handy’ during the crisis.

‘Having a portable ultrasound machine helped us in this situation; “We were able to look at things we didn’t have,” he explained.

While the astronaut did not elaborate on the medical emergency, the fact that ultrasound was used suggests two possible causes.

First, ultrasound scans are often used to study how astronauts’ heart systems function in low gravity.

Mike Fincke refused to share details about his condition or current health but praised his colleagues and medical team for their ‘professionalism and dedication’. Pictured is Fincke after returning from the ISS last month

The other main use of ultrasound in space is to monitor astronauts’ eye health.

However, ultrasound can also be used as a general diagnostic tool in a wide range of medical cases. It is not yet clear what a medical emergency is or how ultrasound is useful.

During the press conference, Fincke explained that the crew had a lot of experience in using the ultrasound machine to track changes in the human body, which is why ‘the ultrasound machine comes in very handy when we encounter an emergency situation’.

The Crew-11 pilot went so far as to claim that all future space flights should be equipped with portable ultrasound machines.

‘Of course, we didn’t have any other large machines that we had on planet Earth,’ he said.

‘We try to make sure that everyone is really, really not prone to surprises before they fly. But sometimes things happen, surprises happen, and the team was ready… Preparation was very important.’

Since 2011, the ISS has been carrying a modified, off-the-shelf ultrasound machine called Ultrasound 2, which is used in both biomedical research and routine health checks.

Ultrasound 2 is typically used to address two primary medical concerns: heart and eye conditions.

In a sustained state of microgravity caused by free fall, blood tends to drift upward from astronauts’ feet and pool around their heads and chests.

This was the first time a crew member’s mission on the ISS ended early for medical reasons.

This significantly increases the risk of blood clots forming, which can be life-threatening if they migrate to the heart or lungs.

In 2020, a NASA astronaut developed a large clot in his internal jugular vein during a spaceflight and had to stretch the station’s dwindling supply of blood thinners to last more than 40 days until supplies could be shipped.

The other main use of ultrasound in space is to monitor astronauts’ eye health.

As fluid accumulates in the head, they can cause swelling, which triggers a series of changes in the eye and brain called ‘spaceflight-associated neuro-ocular syndrome’.

Increased pressure around the optic nerve causes the connection between the eye and the brain to swell and the back of the eye to flatten.

This can lead to blurred vision and long-term damage to the astronaut’s vision.