WT
No blame at all. I should have made myself clearer - to use the yukky modern parlance, "I miswrote."
For scheduled maintenance they would drag the craft up the slipway (if they had one) so the problem of sunken tools did not arise, but as all here know, aircraft sometimes develop "snags" which need fixing ASAP, hence the maritime mechs. need to tether their tools while working above the water.
Ian BB