Acrylic has a compressive yield strength of 95 MPa, which is the sort of pressure you’d find at around 9000m under the ocean. Perhaps the way it was designed an

Acrylic has a compressive yield strength of 95 MPa, which is the sort of pressure you’d find at around 9000m under the ocean. Perhaps the way it was designed and mounted meant that simple crushing was enough to crack it? https://www.matweb.com/reference/compressivestrength.aspx https://www.matweb.com/reference/compressivestrength.aspx https://www.engineeringtoolbox.com/hydrostatic-pressure-water-d_1632.html https://www.engineeringtoolbox.com/hydrostatic-pressure-wate...