Its a cargo boat
I dont know if you have red the website, because these ribs will be used for fast transport. They will take an load of 12.000 kilo cargo and an extra 4000L fuel.
So going from point a till b overseas wih much load as possible and also as fast as possible.
When they fill up these monsters with cargo and fuel the whole Rib will go deeper in the water so the tubes will be on the water. Then it will look as an ' normall' rib with lower sides. For that purpose these M-RIBS are build. I have visit them and they also make an whole range of very good and professional normal ribs. But there speciality are these big cargo RIBS.