HELP - There's a hole in my synergy drive!

So here I was, under the hood topping off the windshield washer fluid, pre-holiday roadtrip. I was admiring the amazingness that is the hybrid powertrain (and anticipating explaining it to relatives - again), and I noticed a strange thing...

I was looking down into the space behind the inverter, at what I'm guessing is the main traction electric motor, and there's a deep threaded hole in the top of it, with nothing in it. It looks like it should have a bolt, or at least a plug/bung in it. I know this sounds like a very strange query, but is this normal? (Or, can you take a quick peek at your car and see if yours is the same...)

Here are two quick photos, with the hole in question circled in yuck-green. (Sorry for the off-focusness of the 2nd one, but the hole in question is about a foot below that bracket that's in focus.)



closeup:

 

Argh! - the elves are being bad to me today. I was unaware that the splendid mods had moved it for me so quickly... My bad - I guess I'll be collecting coal on Sunday!

In other news - YES - if you clicked through to this thread, please visit the appropriate one that Tom linked above. Thanks.