[Jimbuna]

Originally Posted by CCIP

Not quite. All minefields in SHIII have settings for maximum/minimum depth that they cover. Anti-submarine minefields are laid against submerged subs. In fact the very idea behind those fields is to allow light patrol ships (and aircraft) to patrol freely above the mines, forcing subs to submerge.

But there are other mine barriers in SHIII. For example the mines that some mods include outside of bases are near the surface and will kill you if you try to sail over them.

Precisely