Satellites are searching for alien life on distant planets, but a scientist's strange encounter suggests we may want to look deeper into our world.

Bob McGwire, a professor at Virginia Tech and with the Institute for Defense Analyses, was carrying out classified work on the USS Hampton submarine when he heard the sound of 'something whizzing by.'

The onboard sonar determined the unidentified submerged object (USO) was traveling through the water faster than the speed of sound, he has calimed.

Such speeds underwater should have crushed the submarine, according to McGwire, but he said it was as if they were standing still.

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