We never really knew how long The Order has been around; it was a long time. In one of their meetings, they told stories to some of the inductees like Ms. Beckindsale. Apparently they really had been around since the dawn of time, or at least long enough for dinosaurs to be an everyday occurrence.
So because of the nostalgic feeling going through them they decided to do something they don't usually do. The Sovereign Order of Monte decided to recreate the prehistoric period. They decided to do it in a top secret place inside the center of the Earth. What people didn’t know about the movie Jurassic Park was, it is really a place, and it was one of the biggest secrets the Order have ever had, and because they are perfect creatures they did not like to talk about it. You see everyone in Jurassic Park were really there. The dinosaurs were real. Those who died really did die there. The Order just wanted to see the humans interact with the dinosaurs.
Sam Neil and Laura Dern are members of the Sovereign Order of Monte Cristo. Don't you think its strange you have not seen them much since that movie? So here they were at the center of Earth when all of this went down. The Order has kept them under wraps since.