Disclaimer: I do not own any of the characters from Thunderbirds Are Go - they belong to the late Gerry and Silvia Anderson

Author's Note: Sorry it's taken so long for me to post another fic - I've not been having the best of times with my anxiety and depression. The theme of this fic (Unbreakable) is based upon the 100 Themes Challenge on DeviantArt that I started years ago and never got around to completing. Unlike my last fic, this one is definitely going to have a second chapter. I hope you guys like it! Please do leave a review and let me know how I've done!

As space monitor of Thunderbird Five and generally International Rescue's first point of contact, John Tracy tended to pride himself on his ability to stay calm in even the most stressful situations.

Today was not one of those days.

Their latest situation was located in an old tin mine - long abandoned from many moons ago. Two urban explorers had been reckless enough to trap themselves within its confines - one of which had sustained a broken ankle during their attempts to escape.

As per usual, Scott had been first on the scene in Thunderbird One; with Virgil and Gordon not been too far behind in Thunderbird Two.

It had been a pretty straightforward rescue: John and EOS had managed to pinpoint the location of the stricken explorers by the time Scott had set the high-speed craft down - the pilot still grumbling about how there had not been enough time to fix the damage to one of the scramjet inlets from their previous mission before being called out again. This, in turn, cut down the average delay between the two International Rescue crafts arriving on the scene - much to Virgil's amusement.

By the time Virgil had landed the large, green craft, Scott had already located the two young men. Virgil had then climbed down to join them, assisting in moving the pair back up to safely where Gordon was standing by to receive them after having prepared the medical bay on board Thunderbird Two.

It was a textbook rescue.

One that the two eldest Tracy brothers had done more times than they could count.

And then, it all went to shit.

Scott and Virgil had just helped the remaining uninjured man up the side of the abandoned mine when the ground beneath their feet had given out.

Quick to react, Scott yelled a warning to Gordon to keep clear; shoving the remaining explorer in his direction - sending the aquanaut tumbling backwards as he caught the man - before he and Virgil disappeared from view, accompanied by the sound of falling rubble.

Up in Thunderbird Five, John's fingers moved deftly across the holographic map, trying his best to keep down the sickening feeling of panic that was slowly rising in his throat.

"EOS, I need a lock on them. Now."

Meanwhile, in the few chaotic seconds that passed, Scott's quick reflexes kicked in and he managed to fire a point blank shot from his grapple gun - the line embedding itself into rock and going taught. Simultaneously, Virgil reached up, grabbing onto his brother's ankle. He cringed as their fall was abruptly halted; as Scott yelped out over the open comms channel from the sudden tension of the grapple line on his shoulders and Virgil's hefty build wrenching his leg.

A chunk of falling rock rebounded off another sizable boulder, hitting Virgil square in the chest and he let out a grunt of pain as his hand slipped.

"Virgil!"

I hope you enjoyed reading this - sorry to leave it on such a literal cliffhanger. I'm already working on the next chapter, but do let me know what you think and thanks so much for reading.