Komatsu's biggest hydraulic excavator is PC8000. It weighs 685 tons and a capacity of 3,730 horsepower. Its bucket can hold as much as 117 bathtubs can. The driver's seat is located 27.7 feet (8.45m) high from the ground, which is as high as the third floor of a building.

Hydraulic excavator PC8000 [THE GREAT PICTURE BOOK OF CONSTRUCTION EQUIPMENT]
There is also a construction equipment “Dragline” that is as tall as a 23-story building.