Ok i'm posting for the first time so here it goes
I know that maybe this has been post a couple of times and if it actualy is i'm very sorry for spamming
So to get under SW is best to have a char. with a little movement speed increase(it helps a lot),but also normal chars can do it too
When u are in SW go to the tunnel that leads to the river and Mage trainers-the passage way which is located near the bank(u can see it in the screen shot) and jump on the boxes which are on its right side
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Like so...
Next thing u need to do is jump to the torch that is infront of u(u wont be able to jump on it from the boxes)-If u succeded u should be standing infront of the torch like this(u can aslo reach this position by wall climbing but its harder):
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Note: dont jump from near the wall or it will stop your jump(blizz made some kind of improvement over there in the last few patches)
After gettin there with an easy jump u get on it like this
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When on the torch jump on the wall(there is enough space to walk there :P)
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"X" marks the spot hehe-there is the hole from witch u get under SW and btw u can see parts from SW if u move your mouse view to look from there(to touch the wall)
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sooo...now u walk into the "X" marked spot and fall under it
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when u are down and done looking around u can still look at your map and choose the mage training tower location and go there until u see a big square that is missing from the ground(there exactly the mage tower is standing)
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U must jump in the circled area of the square or u will be falling till u reach the great see and die there
If u jump in the selected area u will find yourself in the mages portal room :P but I MOSTLY RECOMEND using a HS to get outta there or there is a chance to bug your charecter like i did(i cant show a screen because i didnt jump in the right area and my char got bugged sorry)
I hope u like it under there but i find it most boring after being a few mins there
Ok i got it but i'm too lazy to edit now :P