The heaviest precast drainage unit, weighing 1 100 tonnes, had to be lifted by the lifting crane Nan Tian Long.

The heaviest precast drainage unit, weighing 1 100 tonnes, had to be lifted by the lifting crane Nan Tian Long.

The heaviest precast drainage unit, weighing 1 100 tonnes, had to be lifted by the lifting crane Nan Tian Long.

The heaviest precast drainage unit, weighing 1 100 tonnes, had to be lifted by the lifting crane Nan Tian Long.