Half-Life 2: Episode Three Cave
Not a whole lot is known about Half-Life 2’s legendarily canceled third expansion. In 2017 ex-Valve writer Marc Laidlaw released a piece of writing on his website titled Epistle 3 that many interpreted as a mildly disguised story synopsis for the canned expansion. (More recently Laidlaw expressed regret over making the post.) In any case, Epistle 3 suggested Half Life 2: Episode Three might’ve been set in a frozen biome, at least partially, and here we see some concept art of an underground cave filled with ominous-looking machinery.
