GSLV MARK III

Also known as the 'Fat Boy', GSLV Mark III is India's heaviest and most powerful rocket ever to be made and has been reportedly compared to the weight of 200 elephants or five jumbo jets.

The launch of GSAT-19, GSAT-11 and GSAT-20, will take place over 18 months and promises to transform connectivity around the country.

"This vehicle is going to be at the frontier for ISRO. It can be used for human flight as well," G Ayyappan, Mark III project director.

The satellite will be launched from Sriharikota spaceport in the first week of May with the Indian Geosynchronous Satellite Launch Vehicle Mk-II.