The top string of temperature sensors on the moorings was attached with weak link so that it would detach if caught on an iceberg and prevent the whole mooring from being dragged away.
Having lost its buoyancy, the entire mooring fell to the seafloor.
The moorings were designed to be pushed down by iceberg keels and float back up upright after the icebergs passed.
Scientists knew the moorings they deployed in Sermilik Fjord would be in harm's way of icebergs.
But a huge iceberg pushed one of the moorings down to a depth where the water pressure was so high that the mooring’s top float imploded.