[RACooper]

Ummm they knew the ice was around - that's the point of touring through the ice flows.

Anyways icebergs aren't always the pretty white things floating along the surface, and they got caught at dawn in grey waters with grey ice and got hit by a sub-surface small iceberg - basically they got smacked by 10000 year-old ice that's so dense it doesn't really break the surface... and alot this type of ice is floating around after the Larsen Ice Shelf started falling apart over the last five years.