The firm behind the Belfast Sewers project has won an industry award for construction excellence.
Finance minister Sammy Wilson announced Morgan Farrans as the overall winner of the CEF Specify Construction Excellence Awards 2010.
The company created the six-mile stormwater tunnel under the city, made famous by the Top Gear team staging a car race through it last year.
Designed to alleviate flooding, the £160m infrastructure project began in 2006, in conjunction with NI Water, and work was completed in May of this year.
Over 100 other projects competed for the CEF Specify award, including the Obel Tower and Belfast Model School for Girls.
Glasgiven Contracts won the Social/Community Construction award for Tollymore Mountain Centre. They missed out on the top gong but received a special commendation from the judges.
The Culloden Hotel was the setting for the awards ceremony, now in its 11th year, which was attended by over 400 people last week.
Concern about the future of the construction industry has been expressed ahead of the impending Comprehensive Spending Review.
Mr Wilson pledged that improvements in procurement practice would make government projects more accessible to construction firms.
CEF managing director John Armstrong said: "I encourage the minister and his executive colleagues to take bold steps to ensure that we continue to be able to celebrate such achievements."