In the Netherlands subsurface data is legally arranged via The Basis Registratie Ondergrond, aka BRO: https://basisregistratieondergrond.nl/.

TNO manages this data. The data is 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
• https://basisregistratieondergrond.nl/ which is the official BRO site (Dinoloket, is a specific service of TNO, but hosts the same data)

There are four subsurface models as explained on https://www.dinoloket.nl/en/explanation-subsurface-models.