How do containers on a container ship stay stacked?

Question

In a container yard, containers are just sorta stacked ontop of eachother without being locked to one another. On a ship, this surely can’t be the same cause they’d just tip over at sea?

In: 1

Answer 1

If you look in the corners, there are round pipe shapes. The container above then has a rod that comes down and locks in with the container under it. They also weigh an immense amount and require a lot to slide.