Hyderabad, July 16 -- The Department of Space (DoS) has tightened rules governing voluntary retirement and resignation of scientists attached to Gaganyaan and other flagship missions, after more than 100 personnel from the Indian Space Research Organisation (ISRO) quit in recent months, the Times of India reported citing sources.

A fresh internal memorandum, dated July 14, was issued after the space department took note of the scale of departures, even though it has not officially disclosed the numbers involved.

Key project staff among those who left

According to TOI, sources familiar with the matter estimated the exits at anywhere between 100 and 120, with more cases reportedly under evaluation. Of these, around 80 are said to have qu...