Anomaly review of last launch failure.
https://www.rocketlabusa.com/updates/rocket-lab-sets-next-electron-launch-window-provides-update-on-anomaly-review/
"The world's biggest iceberg is on the move after more than 30 years being stuck to the ocean floor."
https://www.bbc.co.uk/news/science-environment-67507558
You could test that by using bread of various thickness, and measure the concavity versus thickness?
Maybe drying the slices in the oven to remove any moisture, then toasting?