The York Dungeon could be forced to make more than half of its staff redundant following flood damage sustained last month.
Operator Merlin Entertainments said in the worst case, it could be forced to lose 14 of its 25 staff, but would first attempt to relocate them to other positions within the company.
The River Ouse rose by more than five metres on 27 September, causing considerable damage to the Dungeon.
It has been closed since that date and an assessment of the building was completed yesterday, but it is not clear when the attraction will re-open.
A spokesman for Merlin said: “We have begun a period of consultation with the team who understand that the situation is sadly outside our control.
“Our aim is to minimise any need for redundancy, including where possible and practical seeking to find them new roles within the Merlin Group.”