They are believed to have been built thousands of years ago by an alien species known as the Heechee, but little else is known about them until an explorer discovers a Heechee ship, intact and operational, in one of the tunnels.
That is, until an explorer discovers a Heechee ship, intact and operational, in one of the tunnels. They are believed to have been built thousands of years ago by an alien species known as the Heechee, but little else is known about them.
They are believed to have been built thousands of years ago by an alien species known as the Heechee, but little else is known about them. That is, until an explorer discovers a Heechee ship, intact and operational, in one of the tunnels.
They are believed to have been built thousands of years ago by an alien species known as the Heechee, but little else is known about them. That is, until an explorer discovers a Heechee ship, intact and operational, in one of the tunnels.