Submer: Barcelona-born immersion cooling for AGI supercomputers

Spanish startup Submer, based in Barcelona, develops single-phase liquid immersion cooling that submerges running servers in dielectric fluid. Its SmartPod system achieves a PUE of 1.03 and cuts cooling power use by over 95%, with partners including Intel, Nvidia, Dell and Supermicro.

• A frontier-AI rack draws 80–120 kW, the heat of 40 industrial ovens
• SmartPod submerges servers in dielectric fluid with no cooling fans
• PUE of 1.03 versus the typical 1.50–1.60 for air cooling
• Cooling power consumption drops by more than 95%