Two-dimensional (2D) materials, such as graphene, offer a variety of outstanding properties for a wide range of applications; particularly, transport properties. However, transport properties of graphene under pressure are limited to ~1 GPa due to the technical challenges as it is difficult to transfer into diamond and make electrical contacts. At very high pressures, the individual crystal layers of a vdW heterostructure are compressed towards one another. This can significantly enhance the electronic coupling between layers, driving potential reconstructions of the atomic lattice and emergent electronic states. For example, applying pressure to twisted bilayer graphene can dynamically tune the existence and strength of superconductivity and other correlated states. We will develop a novel technique allowing for direct measurements of the transport properties of monolayer graphene under pressures extending into the multi-megabar pressure regime, allowing for adaption to other graphene-based materials, opening a door for studying unexplored phase space and facilitating the advances of next generation electronics for quantum information science.