Cable/wire under backseat - what is it? Can you access gas tank from that opening?

I saw an awesome trick in another car - there was an opening to the gas tank connections from under the backseats.

i had a hell of a time unplugging and plugging in the tank connections and I’m making a video to help people with the same problem I had. I’m wondering if anyone knows what this wire is that goes into a hatch under the left backseat and if I can remove open it and what it’s for, etc!

I replaced my backseats with shelves a while ago, hence the wood you see. I don’t want to remove the shelves if it turns out the hatch and wire isn’t something that can be messed with.

Thanks!