@trippster. Essentially hot chemo was poured into my abdomen cavity immediately after extensive surgery in my abdomen to remove all visible tumours and diseased tissue. I have a huge scar from my pubic bone up to between my breasts where I was cut open to do the surgery. My body was rocked for a few hours to swish the chemo around. The whole operation took 12 hours in my case. I was very lucky to qualify for it after 6 months of chemo and immunotherapy.
https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/hipec-surgery-what-you-need-to-know