Off The Coast Of Britain Is A Giant Dip In The Seabed, And Nobody's Quite Sure What Caused ItOff the coast of Great Britain is something of a deep-sea mystery. Seismic data gathered here during gas exploration revealed a feature on the seabed about 130 kilometers (80.7 miles) off England’s Humber Estuary. Known as the Silverpit Crater, it’s a huge dip that's about 3 kilometers (1.9 miles) wide...