Ruby crystal mines of Burma

The ruby crystal mines of Burma are a place where (presumably) Burmese humans mine ruby crystals containing great and unexplained power, yet the 'Earth humans' merely use the crystals for decoration and jewelry. Foolish flesh creatures!

The Transformers cartoon
With only a little more energy needed to return to and conquer Cybertron, Megatron chose to collect it at the ruby crystal mines of Burma. While the other Decepticons toiled away in the mines, Soundwave claimed that the rubies contained enough energy to power all of Cybertron, leading Megatron to rant that the rubies would give them the means to defeat the Autobots and conquer the Universe!

Until Sparkplug Witwicky and Bumblebee buried the Decepticons in the mine with a small bomb, endangering themselves more than the Decepticons, who blasted their way out of the mines in no time.