Lord Derby lays cornerstone at Wembley, United Kingdom, for Empire Pool

Lord Derby initiated the construction of the Empire swimming pool at Wembley by casting the first concrete slab. The project, employing over 500 men, required the excavation of 30,000 tons of clay and was completed in a record time of eight months. Upon completion, it will be the largest and most luxurious covered swimming pool in the world.

How many men were employed to build the swimming pool?

What will the completed swimming pool be known for?