"There has been an incident in the cruiser grounding dock at the Naval Dockyard in Mumbai involving INS Betwa.
"The incident occurred during undocking evolution wherein it is suspected that dock blocks mechanism failed. Further information is awaited," Navy Spokesperson Capt D K Sharma said.
Explaining the situation, he said the 3850-tonne ship, having a length of 126 metres, tipped over while it was being undocked. The mast of the ship hit the dockyard ground, he said.