'Their deaths must not be in vain'

Katy Stewart has grown up with the fishing industry and knows its dangers. Yet nothing could prepare her for the loss of her brother, not at sea, but while asleep in harbour.

In January, Mark Arries had moored his boat Eshcol in Whitby harbour, along with fellow crew-member Edward Ide.

The next morning, the pair were found dead in their bunks. Initial findings suggest they had been poisoned by carbon monoxide fumes from a butane gas cooker.

Because the vessel was less than a certain size, it was not a legel requirement to fit a carbon monoxide detector, though they are recommended.

Katy Stewart is urging all fishermen to fit the alarms and says they should be mandatory on all vessels.

At the time of the tragedy, the Marine Accident Investigation Branch said fishing crews needed to be vigilant to the first signs of carbon monoxide poisoning and gave this advice:

Katy Stewart says it would be a fitting legacy to her brother and his friend if no other fishing crews were to die this way in the future.

Watch Katy's interview with Helen Ford: