Underground River Tour in Puerto Princesa City, Palawan

I decided to have a short vacation and since I’m in Palawan and my friends are frustrated when people ask them that they are from Palawan and have yet to enter the Underground River (1,500 Pesos/person), we decided to end that frustration.
We booked with Northern Hope Tours a week in advance just to be sure that we get slots to enter the Underground River. I do not want to risk traveling all the way to Puerto Princesa just to be rejected entry.
They adviced us that pick-up will be from 7AM to around 7:30AM, so we had breakfast around 6AM for us to be able to have breakfast and get ready for the tour.
7:00 AM We were picked up in from our accommodation, Kuhl-in Pension. When we boarded there were other groups inside the van and since we were the last group to be picked up the van was now headed straight to Sabang, or so I thought.