Climate scientists have said the small submarine with the publicly-chosen moniker Boaty McBoatface has been successful in its maiden mission.
They say the submarine has helped discover a key process linking increasing Antarctic winds to rising sea temperatures.
This will help climate experts to build more accurate predictions of the effects of climate change on rising global sea levels.
The name Boaty McBoatface was originally proposed in 2016 in an online poll to name a massive Antarctic research vessel.
Although Boaty McBoatface handily won the poll, the boat was instead named after the naturalist Sir David Attenborough.
As a consolation prize the humorous name was used for one of the small yellow submersibles onboard the vessel.
Boaty McBoatface spent three days navigating deep underwater valleys
Boaty McBoatface’s first mission was to study the changing temperatures at the bottom of the Southern Ocean.
The submersible travelled 112 miles through mountainous underwater valleys measuring the temperature, saltiness and turbulence of the water at the bottom of the ocean.
Information collected by the submarine has revealed a mechanism that enables Antarctic winds to increase turbulence deep in the Southern Ocean, causing warm water at mid depths to mix with cold water deeper down.
Scientists say the resulting warming of the water on the seabed is a “significant contributor” to rising sea levels.
Dr Eleanor Frajka-Williams of the National Oceanography Centre said: “The data from Boaty McBoatface gave us a completely new way of looking at the deep ocean.”