Ships of tech 310 or higher can detect mines with their sonar.
See \*Qinfo sonar\*U for more information.
.s1
-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).
-.s1
Note that the sector is checked for possible mine hits
only when a ship moves into it;
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 under a bridge span.
+so moving back into a mined sector is foolish at best.
.s1
-Mines in the same sector as a bridge that collapses are cleared.
+Building a bridge clears all mines there.
.s1
You cannot drop sea mines into a harbor, only land mines.
.s1