A modular sample store including a storage area; a service area; a transfer area; a motorized robot with a lifting device and at least one platform; and a controller. The sample store service area includes one integrally formed cubic vat module and the sample store storage area includes at least one integrally formed cubic vat module. Each one of the aforementioned vat modules includes an essentially horizontal vat floor and four joining vat walls that are connected to the vat floor and that are leaving an open vat space. The modular sample store also includes upper side walls and a cover plate to close the sample store. Each vat floor and vat wall includes an outside liner and an inside liner, which outside and inside liners in each case are separated by a clearance. This clearance is essentially filled with a polymer foam material that provides fixation of the outside and inside liners to each other as well as thermal insulation of and reinforcement to the thus integrally formed cubic vat module sandwich construction.