The Guardian reports that Solar Impulse 2 has completed the first ever crossing of the Atlantic by a solar-powered aeroplane, landing in Spain early on Thursday morning.

The four-day trip, which started in New York, was the latest leg of a round-the-world journey due to end in Abu Dhabi.

During the crossing, pilot Bertrand Piccard spotted whales breaching the waters beneath and an iceberg that had floated south from the Arctic. The purpose of the circumnavigation is to showcase the capabilities of clean, renewable energy.

“The Atlantic is the symbolic part of the flight,” said Piccard, speaking to the Guardian from the cockpit a few hours before landing. “It is symbolic because all the means of transportation have always tried to cross the Atlantic, the first steamboats, the first aeroplane, the first balloons, the first airships and, today, it is the first solar-powered aeroplane.”

While it's not specifically about conservation tech, it is an interesting blue sky project that reveals what's could be possible in the future.