For an interesting experience with subnets, prior to 1940' Gibraltor has no subnets at all, you can just submerge and walk right in the front door. Now...if you were to go inside on the evening of December 31st 1939 and then leave on January 1st 1940 you'd end up hitting a subnet on the way out.
In clear (blue) water and if you have the water transparency turned up you can sometimes use the observation scope (raised just a few meters) to see if there is a net in front of you. Long as you have good water visibilty (30-60m) and good light you can usually see the subnets unless you're right up against it. Move back a few meters and if one's there it will likely show up. Unless you use the external camera or your bow (i.e. keep poking until you find it by ramming into it) its impossible to see the nets at night - though in most harbors subnets are marked by bouys. If you see a pair of red buoys that span the harbor or a specific area that will mark the subnet, usually these you can go over safely if you are surfaced.
Minefields are like migranes, they come out of nowhere and hurt like hell; sometimes easily dispatching your ship and graciously helping you to start a new career if you're unlucky. Personally only time I've seen the mines themselves is when they are tethered to the bottom and are floating mid-water (see them during the event cam shots).
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