What are Devils Hole and Silver Pit in the North Sea?

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North Sea The North Sea, the Baltic Sea, and the English Channel.

Devils Hole and Silver Pit are deep trenches located in the western part of the North Sea. These features are believed to have been formed during the last glaciation, potentially by rivers eroding deep channels into the basin floor when parts of the sea were free of ice.1

Devils Hole: Located off the coast of Edinburgh, this trench reaches depths exceeding 1,500 feet (450 metres).1
Silver Pit: Situated off the bay of The Wash in England, this trench reaches a depth of nearly 320 feet (95 metres).1