Our boatyard has two cranes, a big one and a little one. They can lift enormous boats out of the water. The bottom is washed and the water is filtered and then the boats are set down to be worked on, all over the boatyard.
When my kids were little they had field trips from the school to the boatyard. My daughter’s class had a trip to see the crane because one of the parents works as a crane operator. All the second graders learning about the boatyard: fabulous.