Related but not the same: What's the radius of the explosion caused by a single reactor ignition of the Death Star superlaser?
The Death Star can shoot at targets with a "single reactor ignition" when there's no intent to blow up the planet in the process. While the linked question asks about the radius of the resultant explosion on the surface (which never received a conclusive answer anyway), I want to know how deep the superlaser can reach at this reduced level of power.
Given that the Death Star's superlaser can reach a planet's core at full power, how deep into the planet can it reach when fired with only a single reactor ignition?
Note: The deepest penetration is probably when the Death Star fires from directly overhead (perpendicular to the surface) as at Jedha, rather than any angled shot like the one at Scarif.