If you have ever wondered about the size of the machinery used to service the pilings in a marina, wonder no more!
A massive crane sits atop a large barge that is controlled by two tug boats. One tugboat is attached to the transom of the barge and operates as a push boat to control the fore/aft motion. The other tug boat sits athwartship and serves as a bow thruster, managing direction of the barge.
This massive contraption was able to delicately maneuver through the marina, pulling out the severely warn massive pilings so that they could be replaced.