Many years back, a young boy was walking along the Kurtna Matasjarv Lake in Russia and noticed something peculiar. He found tank tracks leading into the lake, but couldn’t source any coming out of the lake. For two months, he returned to the spot to check out what was happening, and once a day, he noticed air bubbles emerging from the lake. He ignored it, but 50 years later, told the story. Local war enthusiasts were intrigued and decided to look into this a bit more (Source). Could it be that an armored vehicle was submerged in the lake?