Coral

Summary
Coral is a human planet.

As described in Conversations from the Universe, a mining operation uncovered the tip of a Forerunner installation. The miners used explosives to evaporate a depth of 30 meters, except for the tip of the installation, which wasn't even scorched. Archaeologists funded by ONI were able to dig out about eighty meters of the complex, which seems to be much bigger. The complex has been described as made from metalic crystal, symmetrical to a near-atomic scale, yet adorned with decorative artistic motifs.

The planet has since been glassed by the Covenant.