100m Jokes

After digging to a depth of 100m last year, Russian scientists found traces of copper wiring dating back 1000 years, and came to the conclusion that their ancestors already had a telephone network one thousand years ago.
So as not to be outdone, in the weeks that followed, American scientists dug 200m, and headlines in the US newspapers read: "US scientists have found traces of 2000 year old optical fibers, and have concluded that their ancestors already had advanced high-tech digital telephone 1000 years earlier than the Russians."
One week later, the Antartian press reported the following: "After digging as deep as 500m, Antartian scientists have found absolutely nothing. They have concluded that 5000 years ago, their ancestors were already using mobile phones.