Which country scientists just deployed a giant telescope underwater for the first time?

Correct Answer: C. Russian

 Russian scientists on Saturday, 13 March 2021 launched one of the world’s biggest underwater space telescopes to peer deep into the universe from the pristine waters of Lake Baikal. The telescope, Baikal-GVD, is designed to search for neutrinos, which are nearly massless subatomic particles with no electrical charge.