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Use "sub-surface" in a sentence
"For instance, MEX was the first spacecraft to detect methane in Mars' atmosphere and was also the first in discovering Martian sub-surface water, both raising provocative questions regarding the potential for life on the Red Planet."
"You can work them just sub-surface and they cast far, so you need not be right on top of the fish."
"But a fast retrieve will get it as deep as twelve and it also works really well just sub-surface if you slow-crawl it."