Spoiler:
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Tomb in the docks is in the "sail" building (can't remember exact name - its on the west side in the middle and labeled).
This building is part of the general quest as well - you need to go into this "sail building" and go down below to the aqueducts. As with the rest of the tomb areas you need to find the door with the chest outside that will not open without the right artifact put in the chest.
Cheers
