In the Netherlands subsurface data is legally arranged via The Basis Registratie Ondergrond, aka BRO: https://www.broinfo.nl.
TNO manages this data, and serves it . The data is i) distributed via interactive web portals:
- http://www.nlog.nl for deep offshore areas
- https://www.dinoloket.nl for land, and some data for offhsore areas
and ii) via EU INSPIRE compliant web services via: https://www.broinspireservices.nl/arcgis/rest/