I‘m impressed that they were able to transport a obelisk as one piece with a ship. Were they able to built large enough ships from wood? According to Wikipedia

I‘m impressed that they were able to transport a obelisk as one piece with a ship. Were they able to built large enough ships from wood? According to Wikipedia the largest ships they built were 30m long with a width of 5m. Going 1.5m deep they were able to transport several hundreds of tons. I still wonder how they managed to load the obelisks onto the boat without capsizing it.