[mwbajor]

What makes an explorer an explorer? To me, and to most people, I would think it means to find something previously undiscovered.

Nobody was calling the passengers on the MIR submersibles that have been visiting the titanic since the 90's "explorers" because it was already discovered and heavily documented.

At some point it ceases to be considered "exploration". Also, most explorers have been paid to do the exploration, not the other way around.