  In this Essay, we will look at the relation between the No Transmission
principle and the Strong cosmic censorship (SCC), which we will highlight in
the background of quantum gravity. We show that taking quantum gravity into
account, one can provide a complete picture of the instability of the inner
horizon and the principle that two independent CFTs, under the gauge-gravity
duality, imply that the dual bulks must also be independent in that there must
not exist a way to transmit a signal between the two spacetimes. We show that
this can simply be interpreted as SCC, and that the inner horizon must be
unstable (at either linear or nonlinear orders) to be in accordance with
holographic quantum gravity.
