Investigation of underwater prehistoric sites during the twenty-first century has been gathering momentum. This has been a positive development for the discipline that has been strengthened by research into human occupation of the drowned lands around the British coastline, particularly the submerged forests of the Solent seaway on the south coast of England as well as the North Sea. Over the last two decades underwater investigations at the Mesolithic site of Bouldnor Cliff, off the isle of Wight has revealed advanced wood working technological capabilities, the presence of sedimentary DNA from einkorn and outstanding levels of organic preservation including string, worked timbers, and most recently, a wooden platform. The timber assemblage represents the most extensive collection of Mesolithic worked wood in the country including previously unknown methods of timber working and wooden artefacts. The material evidence indicates links across Europe, while the wooden structures suggest some degree of sedentism. The site was occupied just prior to the severance of Great Britain from continental Europe, therefore, similar sites could remain in comparable landscapes before they were drowned by the emergent North Sea. This paper presents new evidence from Bouldnor Cliff to support previous interpretations, demonstrates how shallow underwater sites near the modern coastline can reveal new information about patterns of land use, population contacts and dispersal patterns over wide areas. It highlights their significance as a complement to large scale mapping of more deeply submerged landscapes and as a model for the discovery of archaeological sites in deeper water, and emphasises the need for more intensive investigation given the constant threat of erosion and destruction of such evidence.