Ships of tech 310 or higher can detect mines with their sonar.
See \*Qinfo sonar\*U for more information.
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-Harbors and sea sectors under bridge spans can be mined.
+Sea sectors under bridge spans can be mined.
Your ships will automatically avoid these mines when passing through,
(and your minesweepers will not not pick them up).
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thus, a ship may safely drop mines in a sector and then move out.
On the other hand, the mines know no allegiance,
so moving back into a mined sector is foolish at best
-unless it is a harbor or under a bridge span.
+unless it is under a bridge span.
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Mines in the same sector as a bridge that collapses are cleared.
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+You cannot drop sea mines into a harbor, only land mines.
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.SA "navigate, Hitchance, Damage, Ships"