KEY LARGO, Florida -- Astronauts are set to begin testing new tools that could be used on the Moon.
NASA is planning another manned mission to the Moon.
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Astronauts are getting ready by performing tasks underwater in the Atlantic Ocean off the coast of Key Largo, Florida.
The conditions there mirror zero gravity.
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The equipment being tested includes a "Lunar evacuation system assembly."
It enables an astronaut to deploy a structure that acts as a mobile stretcher.