For one thing, containers, the space between them, and the extra space inside them would take up a not-insignificant amount of space. They're great when you are dealing with a lot of smallish shipments, but if you're loading full of bauxite, gravel, or garbanzo beans, they're inefficient.
The crane scoop thingy at about 1m11s looks to be about the size of a 20ft cargo container. Some ships and many ports have conveyor-belt doo-dads to unload bulk cargo.
[Edit] These are "regular cargo ships". Container ships are the new kid on the block, dating from after the 1950s, IIRC.
The crane scoop thingy at about 1m11s looks to be about the size of a 20ft cargo container. Some ships and many ports have conveyor-belt doo-dads to unload bulk cargo.
[Edit] These are "regular cargo ships". Container ships are the new kid on the block, dating from after the 1950s, IIRC.