India unveils astronauts for 1st human spaceflight mission in 2025

India has revealed a shortlist of air force pilots who will fly on the country's first human spaceflight mission.

Indian Prime Minister Narendra Modi unveiled the four "astronaut-designates" at the Vikram Sarabhai Space Centre, in the southwestern state of Kerala, on Tuesday (Feb. 27). 

The selected individuals are Group Captain Prasanth Balakrishnan Nair, Group Captain Ajit Krishnan, Group Captain Angad Pratap and Wing Commander Shubhanshu Shukla. All four are test pilots. Modi called them "the pride of today's India," according to The Times of India.

Related: India wants to land astronauts on the moon in 2040

The quartet have been undergoing training at the Indian Space Research Organisation's (ISRO) astronaut training facility in Bengaluru.

Three of the men will form the crew for the first Gaganyaan mission, expected in 2025. This will see a crewed spacecraft spend three days in orbit at 249 miles (400 kilometers) above Earth. Gaganyaan is the Sanskrit word for "celestial vehicle."

The announcement follows ISRO making progress on an engine for the rocket that will launch Gaganyaan. The agency has been performing a number of major tests, including verifying an emergency-escape system and recovery procedures, as it gears up for the full-blown mission.

India plans to launch its first uncrewed Gaganyaan test flight before the end of the year as a step toward sending humans into orbit. At present, only the United States, Russia and China have the ability to independently launch people into space.

India's space program has scored a number of successes in the last year. Achievements include landing on the moon with the robotic Chandrayaan-3 mission and launching the Aditya-1 solar probe to Earth-sun Lagrange Point 1. The country, boosted by these milestones, has set out plans to establish an orbiting space station by 2035 and put astronauts on the moon by 2040.