This undertaking had two round windows used as monitors for divers' supervision. Even though they were not that large, their depth resulted in them having to be 60 and 70 mm thick.
As the pool has the moving floor, we were obliged to keep rigorous precision installation regime of 3 mm. Additional challenge was to set the windows in place for the time of seal polymerization. To do this we had made a steel construction that held window in place until process ends.