Why are ship anchors so heavy?

Answer: Weight creates holding power

Weight creates holding power ✓ — Correct! Anchor weight provides holding power through three mechanisms: (1) the weight itself creates friction with the seabed, (2) weight helps the anchor dig into sand or mud when pulled horizontally, creating much stronger holding power, and (3) the heavy anchor chain lying on the seabed adds additional holding force. Large ships need anchors weighing several tons!

Heavy metal is waterproof — Wrong. Metal type and waterproofing aren't related to why anchors are heavy. Steel anchors resist corrosion adequately without extra weight. Anchors are heavy specifically for holding power—weight creates friction and helps them dig into the seabed to resist currents and wind. Waterproofing is achieved through material choice and coatings, independent of weight.

To balance ship weight — Wrong. Anchors aren't heavy to balance ship weight—ships are balanced through hull design and cargo distribution. Anchors provide holding power when deployed: their weight creates friction with the seabed and helps them dig in when pulled horizontally, preventing the ship from drifting. When raised, the anchor's weight is negligible compared to the massive ship.