 Groves, Oppenheimer, and Colonel James C. Marshall and Lieutenant Colonel Kenneth Nichols all squeezed into a single compartment where they talked about how a bomb laboratory could be created, and how it would function.Groves subsequently had Oppenheimer come to Washington, D.C., where the matter was discussed with Vannevar Bush, the director of the OSRD, and James B. Conant, the chairman of the National Defense Research Committee (NDRC).On 19 October, Groves approved the establishment of a bomb laboratory.