Adelie 14 (2003)

From the file's introduction

Not all international intrigue happens in presidential palaces, plush business offices, and smoky dives next to waterfronts. Some happens in the coldest, dreariest, most desolate places in the world. But regardless of the setting, the question is always the same: Who’s lying?

Adelie 14 is a d20 MODERN adventure set in the frozen wastes of Antarctica. In it, a group of 6th- to 8th-level characters becomes enmeshed in a deadly web of international intrigue and doublecross that spans more than half the globe.

A Short Adventure for Four 6th- to 8th-Level Heroes