I've always found it interesting, that HMS Hood had three anchor chains:
When it comes to ships, the heavier they are (in terms of displacement), the more anchor chain you need, to keep your ship from moving, when laying anchor. Granted, it's the anchor that digs into the sea bed, but the chain also lays on the bottom - thereby resisting the movement of the ship. In 1937, Hood had three anchor chains - but by 1940, the closest anchor chain (shown above) had been removed. Yet here do I find a paradox! For HMS Hood's displacement, gradually increased over time (through various overhauls and refits) - so surely she would need the safety-net, of a third anchor and chain, even more?