The solar-powered plane known as Solar Impulse 2 has cleared the most dangerous leg of its voyage around the world, landing safely on the Hawaiian island of Oahu on Friday morning. The plane had taken off from Nagoya, Japan, last Sunday.

After several weeks of delays and two aborted attempts, Swiss pilot André Borschberg was finally able to complete what he called “probably the flight of my life.” (Read more from Borschberg.)

The grueling 116-hour voyage over nearly five days allowed the solo pilot only about three hours of rest per day, broken up into 20-minute sessions while the craft was flown by autopilot.

This latest accomplishment proves that “energy efficiency, solar power, and modern technology can achieve the impossible,”