ET Infra. Preferred Source Google Discover Patna, Nov 10 (PTI) Bihar Chief Minister Samrat Choudhary on Tuesday launched a catamaran service on the Ganga river between Digha Ghat and Gandhi Ghat in. Patna launches water metro on the Ganga ahead of Chhath, linking Digha Ghat and NIT Ghat over 9.5 km with fares fixed at Rs 50 per passenger.