| The USNS Bowditch was in the region to conduct research |
The US has issued a formal request
to China to deliver an unmanned underwater drone that was seized in
international waters, US officials say.
The device, dubbed an "ocean glider", was used to test water salinity and temperature, officials say.
The data was part of an unclassified programme to map underwater channels, Pentagon spokesman Capt Jeff Davis told reporters.
"It was taken" by China, Capt Davis said during a press briefing on Friday.
"The UUV [unmanned underwater vehicle] was lawfully conducting a military survey in the waters of the South China Sea," he added.
"It's a sovereign immune vessel, clearly marked in English not to be removed from the water - that it was US property."