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During your underwater swim, your higher Kai rank and mastery enables you to use the Brotherhood Spell Breathe Water. This magical spell allows you to absorb oxygen from the icy seawater directly into your bloodstream through the pores of your skin, negating the need to surface repeatedly for air.
In just a few minutes you reach the distant shoreline and break through the surface alongside a shallow stone causeway. Atop this causeway is a track, a spur of which branches off towards the tunnel entrance. With only your head visible above the lake, you cling to the causeway stones and wait patiently for a nearby patrol to march past.
