The main body of the ship was 30 meters tall. So it can be separated into ten floors of 3 meters each. But it was separated into five floors of six meters each.
This arrangement was to create enough space to accommodate large objects like Roar and Thor's golem. Roar was 4 meters tall. If space is not created for him, he would find the ship to be cramped.
This is a common arrangement because there are many humans who are four meters tall too. Tall humans are common among cultivators at the third mortal coil who built their foundation with their bodies.
The bodies of those who built their foundation with their bodies can grow from the tenth transformation to the hundredth transformation. This makes them turn into giants. So space must be created for them.
When Arthur and Thor boarded the ship, they found other people on the ship. All of them were wearing uniforms of the Blood Skull sect.
