A coroner in Londonderry is to investigate the deaths of two Donegal lobster fishermen who drowned in Lough Foyle in May 2008.
Daniel McDaid, 70, and his brother Francis, 68, both from Malin, drowned after their lobster boat the Strath Marie capsized.
It happened in waters claimed by both the British and Irish governments.
The victims' families have previously claimed another vessel may have collided with the brothers' boats.
On Monday, Coroner Brian Sherrard told a preliminary inquest in Derry he agreed to a request from the victims' solicitors to carry out a full investigation.