The trust seeking to leave the Rena on Astrolabe Reef has been asked to pay a bond of $8.8 million by the Bay of Plenty Regional Council.
It was one of the most contentious conditions being considered by the panel hearing the application to leave the wreck on the reef.
Environment consultant Nic Conland, who calculated the size of the bond for the Bay of Plenty Regional Council, said it was based on a worst-case scenario.
The bond acts like an insurance policy, providing financial back-up if the applicant and consent holder, the Astrolabe Community Trust, comprising the Rena's owners and insurers, failed to comply with conditions of its consent. It could also be used to clean up unexpected environmental damage caused by the wreck.
However, the trust's view had been that a bond was not needed. It, instead, offered to sign a Letter of Undertaking, an internationally accepted way of providing security to third parties.