When the sea level was lower (such as in the Ice Age) it was a lake in Doggerland, and sea-bed-penetrating sonar bathymetry has found its shorelines and courses and estuaries of rivers that ran into it from the high land of the Dogger Bank; it overflowed into a river at its west end.
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There is an older theory that the Outer Silver Pit was part of the valley of the great ice-age river Urstrom, during some of the Ice Ages when the Scandinavian ice did not meet the British ice, leaving the North Sea bed with open drainage northwards.
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