I wouldn't be at all surprised if there were some health and safety / parts of the structure falling down concerns too. I do know that parts of the aquarium were nearly closed down due to structural problems at about this time. There has been a fair amount of remedial work since the mid eighties and it doesn't all appear to be purely cosmetic.
Various plans included the artcic exhibit, Szechuan encounter and a mountian gorilla enclosure before the short lived 'Bear Mountain'.
Various plans included the artcic exhibit, Szechuan encounter and a mountian gorilla enclosure before the short lived 'Bear Mountain'.