A video has emerged that appears to show the moment when four French tourists plunged 8m into a river on one of the country's Great Walks.
A cable on the Hopu Ruahine Bridge on the Lake Waikaremoana track in northern Hawke's Bay, snapped early last month.
The tourists - three women and one man - escaped without serious injury.
A manufacturing fault was blamed for causing the suspension bridge to break.
At the time DoC said the bridge did not collapse but there was a cable "release" which destabilised the bridge.
An engineering report revealed there was a defect in a section of the high-tensile steel chain used in the construction of the 65m long bridge in 1996.
The incident prompted DoC to check all of its 111 bridges which also used high-tensile chain.
The engineering report said the ultimate design load for the chain on the bridge's 10-person load restriction was about 8 tonnes.
DoC said the chain was sourced locally, and it had confidence that a particular batch of chain was not used anywhere else in the network.
DoC is responsible for about 1300 structures.