The Fjord Cruise departes from: Rådshusbryggen 3.
Google maps link: https://www.google.com/maps/place/Rådhusbrygge+3,+0160+Oslo/@59.910381,10.7290487,17z/data=!3m1!4b1!4m6!3m5!1s0x46416e86d4538687:0xd894b6b7f99a9ee!8m2!3d59.910381!4d10.7316236!16s%2Fg%2F1thtbqs2?entry=ttu
Please check which boat your are on:
Passenger list S / S Helena: https://indico.cern.ch/event/1247911/attachments/2584401/4634547/iworid_boat_masterlist-Helena.pdf
Passanger list S / S Christiana: https://indico.cern.ch/event/1247911/attachments/2584401/4634546/iworid_boat_masterlist-Christiania.pdf
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Link to Ruter app: https://ruter.no/en/journey/the-ruter-app/