Same as we do every year, we returned to The Host Tunnel, a 1.5-kilometer tunnel under central Seoul, with one end large enough you could taxi a 747 in.

1. Waiting for us at the tunnel entrance was Santa himself.


2. I realised after that this picture probably violates social distancing rules. I believe the rule now is gatherings are capped at six, even if you're vaccinated.



3. We marched about 800 meters into the tunnel, where we set up camp on a platform there.




4. There's a pipe here that's only about 50 meters long and has great acoustics, which is what the musical instruments are for.




5. At the other end is a concrete chamber with a couple overflow pipes. I climbed the ladder to peek into that other pipe high up, and it curves right 90 degrees and drops down into flowing water.




6. Here's our staging area where we spend most of our time down here. I had lit a campfire which you can see on the left. It really helps with air quality down there. A couple of explorers brought the projector that created those green stars on the ceiling.




7. While people were sitting around and chatting, Santa jumped out with some fireworks!




8. You can see him a little better here.




9. The monster that lives down here was lurking about.




10. So we showered it with explosives.




11. Santa went toe to toe with the beast.




12. Then we made our retreat back to base camp.




13. Santa activated a force field for our protection.




14. We escaped out the far end from where we'd entered. Ahead is the Bone Tunnnel, a much longer network of smaller tunnels running to the mountains in the north.




15. After that, we went out for a feast of Korean seagull meat.

That looks like the best time ever, and the tunnels are amazing!! Congrats on ur adventure man

looks like fun!