Subvision Surveys are experienced in carrying out geoarchaeological borehole excavation surveys. These surveys use site investigation methods to extract core soil samples across a site, allowing for a picture to be built up of how the site has formed over time, and to identify any layers, features or areas which might be archaeologically significant.

Borehole excavation tends to be carried out at the early stages of a project, alongside or as part of Ground Investigation works. The results are often used to construct or update a deposit model for the site, and can be instrumental in ensuring that any subsequent intrusive works, such as archaeological evaluation trenching or mitigation works, are targeted and proportionate.