Development of new Cryogenic engine 
A milestone crossed in the making of a new cryogenic rocket engine set the stage for the first flight of the country’s most powerful satellite launcher to date, the GSLV-Mark III.
The cryogenic stage and the entire launch vehicle’s readiness is closer to fruition after the engine, technically called CE20, passed the ‘high altitude flight acceptance test’ lasting about 25 seconds at Mahendragiri in mid-December.

Introduction of GSLV MKIII
The Indian Space Research Organisation (ISRO) plans to fly its new launch vehicle powered by this new engine and send the 3,200 kg GSAT-19 communication satellite to space on it.

MkIII becomes ‘operational’ or ready for regular work after two successful launches in a row. ISRO plans to have one MkIII launch in a year, and the next one is planned for December this year.
MkIII, when it completes trials and commences functioning in the coming years, will double ISRO’s lifting power for communications satellites to 4,000 kilos.

About Cryogenic stage
Cryogenic technology refers to technology to deal with matter at extremely low temperatures. In Cryogenic stage, Liquid Hygrogen (fuel used in Launch vehicle) is kept at   −253 °C and Liquid oxygen (oxidiser used to burnt fuel) is kept at −183 °C .
The cryogenic stage is vital for a GSLV rocket as it gets its final and biggest push in space from this stage; it can take a big communications satellite to higher reaches of 36,000 km above ground.

About the Geosynchronous Satellite Launch Vehicle Mark III :
The Geosynchronous Satellite Launch Vehicle Mark III also referred to as the Launch Vehicle Mark 3, LVM3 or GSLV-III)[  is a launch vehicle developed by the Indian Space Research Organisation (ISRO) intended to launch satellites into geostationary orbit and as a launcher for an Indian crew vehicle. The GSLV-III features an Indian cryogenic third stage and a higher payload capacity of about 4000 kgs than the current GSLV of about 2000 kgs.