As my title says, this was originally (for about two decades) a capybara exhibit (with crested screamers mixed in). It was the only underwater capybara viewing I have seen. The original tapir exhibit is the left of this, with a gate that connects the two. Though the gate can be opened or closed, it was never open when the capybaras were there. Now that the capybaras have been moved to the exhibit to the right, the tapir has access to either yard. As you can see there is no filtration system and in all my years the only time I got a clear view of capybaras underwater was when I was there while a keeper had emptied and cleaned the pool and then refilled it and they went in.
Its a really novel and interesting idea and I haven't seen this in a zoo before.
Must be a nightmare to clean those windows for visitors to see the animals while they are bathing though as tapirs do tend to defecate in water bodies.