Feeding conspiracy theories, the Lake Vostok magnetic anomaly remains unexplained. Is this a crashed ship, an ancient city such as the lost city of Atlantis, or is there a simple geological explanation for the anomaly? Because exploring the lake would ruin its pristine condition, the mystery remains. It is known that iron ore deposits and hardened lava from volcanoes or spreading plates will show up as magnetic anomalies. Cities likewise have this signature due to the bulk of metal in their interior. The interior of plates is often thick crust, which likewise can give this magnetic signature. Antarctica is old rock and Lake Vostok lies along a rift running deep through this rock, thus showing a pattern of volcanic rupture when the continent was pulled from its attachment to India in the past.
ZetaTalk August 13, 2011