How hard is iceberg ice?
The crushing strength of ice is around 1% that of steel or 10% that of concrete. Although this may not seem very hard, a ship colliding with an iceberg almost certainly ends in disaster, due to the enormous momentum involved and potentially massive contact region. The ice can literally generate hundreds of tonnes of force on a ships hull, which can cause it to buckle, dent, crumple, and even tear apart.
