It sits on blocking. There is typically a line of blocks running along the keel of the ship. Then there are two additional lines of blocks off center line that

It sits on blocking. There is typically a line of blocks running along the keel of the ship. Then there are two additional lines of blocks off center line that are shaped to the curve of the hull. These two provide support against toppling with the keel providing center line support. [0] Usually they're much higher off the bottom of the dry dock. [0] https://youtu.be/UCHevTrL2Vk?t=24 https://youtu.be/UCHevTrL2Vk?t=24