Some very high end HSMs must be actively powered at all times which makes disturbances in their local environments detectable at all times as well. Getting lucky and drilling through a part of the enclosure that isn't directly protected won't help you if a barometric pressure sensor is tripped as a consequence of breaking the hermetic seal.
[0] https://simkl.com/tv/33956/chaos-communication-congress/seas...
[1] https://media.ccc.de/v/33c3-8127-how_do_i_crack_satellite_an...
That's interesting. I suppose if that technology is in use, the attack would have to occur in a pressure-controlled chamber, so breaking the seal wouldn't cause a change in pressure.
Even a very sensitive pressure checker in a temp controlled sealed box would do it.
Any path can be made into an optical path with a bright enough light. >smile<