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This final excavation report details the licenced archaeological excavation of a souterrain discovered during drainage works (licence holder: Avril Hayes; licence no: A010/001) associated with the construction of the M1, Dundalk Western Bypass Dundalk, Co. Louth. The site was located at Tateetra, a townland located in the northern section of the Bypass. Full site details include: • Project Site No: Site 135, Tateetra 1 • NGR: 302587/309824 • Chainage: 22360 The souterrain was discovered during drainage works along the northwestern side of the proposed road when a drainage trench cut through the southern side of a circular chamber. The souterrain was exposed, recorded and partially excavated. Capstones were removed and the interior of the souterrain was excavated. The walls were left in situ. The passages were filled with gravel and the capstones were replaced. Nine capstones were retained by Dundalk Museum, three of which were decorated. The partial excavation took place from September to December 2004 with a staff level of nine. The excavation project was funded in full by Celtic Roads Design Group. The site was centred at NGR 302608/309830 between project chainage 22360 and 22400 at 10m OD. The southern and eastern side of the souterrain had already been infilled with imported material up to 2m in depth. Infilling was removed by a mechanical excavator working under archaeological supervision. The infill was stripped back to reveal an east to west running gallery (gallery 1) and a north to south running gallery (gallery 2) which ran under the fence line lining the northern/western extent of the roadtake. The entire extent of gallery 1 was exposed to an entrance at east. Subsequent stripping to the east of gallery 1 revealed a linear earthen feature (gallery 3) which ran in a roughly easterly direction and formed a right-angle. Another gallery (gallery 4) extended northward from this right angle where it terminated at north. An area 45m east to west by 35m north to south was stripped in order to expose the full extent of the souterrain. The finds included two cross-inscribed slabs and a stone featuring megalithic art, recovered from the roof of gallery 4; a stick pin and a white paste bead. Analysis of the artefacts and radio-carbon dates obtained indicated that the souterrain was in use from the late 10th to the early 13th centuries AD.