MIT Robot Swims and Flies Like a Puffin

A robot just did something no machine has ever done before: it swam beneath the water's surface, then burst through and soared into the sky using only its wings.

Mechanical engineer Raphael Zufferey and his team at MIT spent two years creating this half-pound marvel, published Thursday in the journal Science. The robot's wingspan stretches nearly three feet, and it moves seamlessly between air and water just like its inspiration, the Atlantic puffin.

"These puffins solve this really challenging task of moving in air, in water despite the huge difference in density," says Zufferey. His team wanted to prove a robot could do the same thing.

The design required some creative problem solving. Instead of including legs (which are tricky in robotics), the team made the robot take off straight from the water using wing power alone. The wings flap five to six times per second during normal flight, but rev up to ten flaps per second to launch from water.

Every electronic component inside had to be individually waterproofed because water floods the entire open body. This clever design keeps the robot light enough to fly but neutrally buoyant in water, so it hovers at any depth without floating up or sinking down.

The team tested their creation at Lake Geneva in Switzerland, where it launched from calm water into the air in less than a second. On a single battery charge, it can fly nearly four miles or swim more than a mile.

Why This Inspires

This breakthrough opens up exciting possibilities for ocean research. The robot could fly to remote coral reefs, dive down to collect water samples and data, then fly back to researchers. It could monitor whale pods, track algal blooms, or observe coastal ecosystems that are difficult for humans to reach.

Glenna Clifton, an animal movement biologist at the University of Portland, says projects like this create a beautiful feedback loop. "The biology inspires the robotics, but then also the robotics are used to understand the biology."

The robot also reveals secrets about diving birds themselves, showing scientists what makes their flight biology so special and efficient.

Nature has been perfecting these designs for millions of years, and now engineers are learning to replicate them for good.