How strong is water pressure at the bottom of the mariana trentch?

Question: How strong is water pressure at the bottom of the mariana trentch?
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  Mariana trench
  
  Water pressure
Asked by anon-290198 on 15 Mar 2021.
- Ben Esse answered on 15 Mar 2021:
  
  The maximum depth of the trench is around 11km underwater, which means that the pressure is around 1000 times that at the surface. What is really incredible is that there is evidence of microbial life at the bottom of the trench!
- Martin McCoustra answered on 15 Mar 2021:
  
  Think about this… 1 kg of water roughly occupies a 10 cm sided cube. If you are at the bottom of the trench… 11,000 m down then there are roughly 110,000 10 cm sided cube above you. That will correspond to 110,000 kg of water bearing down on the face of the cube at the bottom of the trench.
- Philip Camp answered on 15 Mar 2021: last edited 15 Mar 2021 4:01 pm
  
  It’s equivalent to the weight of 70 cars on top of your hand!
- Jesko Koehnke answered on 15 Mar 2021:
  
  Very nicely explained by the three gentlemen who were faster than me.
- Andrew Parrott answered on 23 Mar 2021:
  
  The pressure is given by the height of water above. Pressure = density of liquid * acceleration due to gravity * height, or p = ρ * g * h. In fact you may find old pressure measurements given in mm of a certain liquid (usually mercury). As Ben Esse says when you do the maths the bottom of Mariana Trench gives about 1000 atmospheres.

Question: How strong is water pressure at the bottom of the mariana trentch?