The tunnel forms part of the N18 Limerick Southern Ring Road.

Construction was carried out by a consortium of Strabag, John Sisk & Son Ltd, Lagan Holdings Ltd and Roadbridge Ltd.[4] Traffic and Transportation planning was undertaken by Colin Buchannan and Partners.

Dredging work for the tunnel trench was carried out by Dutch company Van Oord.

The immersion process of floating the tunnel elements out into the Shannon was carried out by another Dutch company, Mergor.

[5] The Austrian EFKON Group commissioned, built and currently operate two toll collection locations, one ten-lane and one six-lane plaza, both staffed.