Just calculated some numbers in Excel to be sure:
Would the IDA have dropped a distance of 1.8 meters at 5g, this would be equal to it dropped from 4.5 meters at normal gravity. With 500 kg mass, quite an impact.
I think even a 0.5m fall would generate forces in the range of tons. But even if the force was low, if it "landed" with a small area, that could be enough to puncture the dome.