For big ships, you need a even bigger drydock. This way, you can do it in a smaller area. From the video, the canal doesn't look that big, and the process seems

For big ships, you need a even bigger drydock. This way, you can do it in a smaller area. From the video, the canal doesn't look that big, and the process seems a lot faster than having to unfill/fill/unfill a huge drydock. Regardless, the ship will withstand much harder forces while crossing the oceans, so might as well make a spectacle out of it and drop that shit into the waters, see some splashing together with cheering.