Bengaluru: A veteran space scientist has strongly vouched for the robustness of the indigenously-built GSLV, saying it was a well-proved rocket and that 'quality problem' led to its failure.

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The count down has started for the launch of India's latest communication satellite GSAT-5P on board GSLV-F06 launch vehicle from Sriharikota on Friday.

ISRO spokesperson S Satish told PTI that the 30-hour count down started at 10.04 hours this morning and was progressing well.