Have you ever heard of window cleaners wearing flippers?
Today the divers have been to the aquarium specially to clean the glass in the under-water tunnel. I thought my window cleaner had it tough going up a long ladder but the glass in the lake tank is much more difficult and involves a specialist diving company. They arrived in full diving suits, in order to stay underwater long enough to clean all the glass.
I hope our giant wels catfish are pleased with their work as I wouldn't fancy them a disgruntled customer!