Atlantian Gold Depository                              -      -      - 
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The Atlantis bank is nothing like any other bank in the world.  Walls are
shined marble and granite, combined to make intricate details on all the
walls.  A small sign hanging at the back of the room reads 'Deposits &
Withdraws' and has a small arrow pointing to a narrow hole below it.  How on
earth that works is beyond you, but the other merfolk in the room appear to
trust it.