: Software that cannot be bypassed by operators.
The phrase "Lethal Pressure Crush 81" appears to refer to agricultural or technical terminology related to livestock management and chemical control in East Africa, specifically within research on tick acaricide resistance. Livestock Management Context Lethal Pressure Crush 81
: At 81 atmospheres, the internal air pressure must perfectly balance the external water pressure. If a seal fails, the resulting "crush" is near-instantaneous. : Software that cannot be bypassed by operators
The update focused on expanding the game's difficulty and atmospheric depth: Lethal Pressure Crush 81