"Sherlock" season 3 may not have an airdate quite yet, but some spoilers are surfacing about the premiere episode, "The Empty Hearse."

During a recent press conference for BBC Worldwide, producer Mark Gatiss managed to sneak in a bit of spoilers despite talking about the missing "Doctor Who" episodes.

When asked if "Doctor Who" will return to the London underground scene, Gatiss has this to say.

"We are due a return to the London underground, in fact, the first episode of 'Sherlock' is--because I am obsessed with the Tube and I think it all comes from that story ['The Web of Fear'] from when I was a kid--is explicitly about the London underground for exactly that reason, because I love 'The Web of Fear,'" says Mark Gatiss.

"But 'Doctor Who,' yes I'm sure, why not?"

Fans are eagerly trying to decipher how the London underground will be involved in "Sherlock" season 3.

Will Sherlock Holmes fake his death by hiding in the London underground, or will the mystery revolve around this scenery? Only time will tell what these spoilers mean.

Meanwhile, Sherlockology has taken the time to painstakingly list out all the "Sherlock" cast and crew who have active Twitter accounts.

So if fans are planning to hound people in the know through social media, check out this list here and see if you can scrape out some "Sherlock" season 3 spoilers!