A hospital in Bristol that accidentally destroyed the sperm of 28 men has admitted liability.
The hospital has put in place new measures
The men were being treated for cancer, which was liable to leave them infertile, when the sperm was destroyed at Southmead Hospital last June.
The families involved have said they will seek compensation. The North Bristol NHS Trust has put measures in place to prevent a repetition of events
Blame is being placed on a fault which developed with a sperm freezer.
A report into the situation said the freezer - one of two - was going to take six weeks to be replaced.
Until then, staff were told to top it up daily with liquid nitrogen.
This was not done on 27 June, and over the weekend the freezer thawed and the sperm was destroyed.
One of the solicitors acting for the families, Jonathan Green, from Foot Anstey and Sargeant, told the BBC: "The Trust has been very honest and has set out what it proposes to do to stop this happening again.
"We welcome the details and the improvements suggested. But it is all tinged with sadness. The whole thing is described as 'avoidable' and it is still very raw."
The Trust will now install a more reliable alarm system; ensure extra monitoring of the freezers and split sperm samples between different freezers.