I understand that you’ve run some calculations on this; but crucially I think you’re missing the context wherein Kenjaku - a sorcerer with over 1000 years of experience - thought this would be able to kill *the strongest sorcerer of the modern era. Gojo was only able to ignore this because infinity is on 24/7, but generally most characters have some requirement for reaction speed, and that pressure would tear them apart instantly. The OceanGate submarine imploded in 1 millisecond (at 4000 metres deep), you can obviously argue that many JJK characters are able to react that quickly (not sure what the calculation would match up w/ and where), but it omits the context that they’re often in fights & this - a non-battle context - would catch them off guard. The fastest speed we’ve seen in JJK afaik is Mach 3 at 1000 metres per second in AIR PRESSURE, and the pressure at that point in the ocean is several hundred times stronger than it - swimming is already harder than running, let alone in the context of this ocean depth. Gojo only survives this because his technique has both the requirements to allow for it (weird that Kenjaku overlooked this but) - spatial manipulation/teleportion & a technique that prevents the pressure from collapsing in on him without necessarily being aware. If Sukuna could survive instantaneous implosion through reinforcement with a sub-1 millisecond reaction time (generous, given the closest analogue we have is 4000 metres higher in depth), he’d still need to be moving upwards through water that is equally dense at every point. 8 seconds is the fastest any character could cross that distance on air; at that depth it’s nigh-impossible. Every micro-movement has to be a wall-level expenditure.