This PDF file includes:

• fig. S1. Full diffraction pattern of Ti₃C₂T_x compressed in excess H₂O at a pressure of 2 GPa.
  
• fig. S2. Full diffraction pattern of Ti₃C₂T_x compressed in excess H₂O at a pressure of 3 GPa.
  
• fig. S3. Analysis of material ejected from the side of the die.

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