The gear the guards are holding at the entrance are a good source of coins, but they do attack in groups. There a few larger monsters in the area, but mostly smaller stuff.
Directions
toggle long dirs / reverse dirs
From Heart: e, swim, 2n, w, 8n, u, cave, use orb, 2w, 2n, enter solace
From Heart: e; swim; n; n; w; n; n; n; n; n; n; n; n; u; cave; use orb; w; w; n; n; enter solace