The man was working inside the trench in the village of Letterston when the sides caved in. A specialist rescue crew is at the scene, along with firemen and paramedics.
More top news
We look back at some of the stories, people and events that stood out in 2014.
Italian vodka, suspicious sediment and antifreeze sold as spirits are among the potential danger signs for shoppers stocking up on alcohol.
Any showers in the north will clear away quickly to leave a dry and bright day with plenty of sunny spells.