There are WDT walls blocking you from leaving each Argus area (The same walls preventing you from reaching GM Island -
http://puu.sh/xr5WC/f111e98c1d.png) You can mod the client to add a path between each zone (
http://puu.sh/xr61k/daf7b0b835.png) but afaik JH16 hasn't released the modified exe to allow model editing yet. You may also be able to use Second World however I believe its fixed atm.
It's not really worth the time investment, it's near-impossible (if not impossible) using ingame methods afaik.