Hello Curtis,
Attached are four photos of the entrance to the Inner Sanctum at the
head of Long Cove. The first two are facing into the Sanctum, the
second two facing out. Being an impetuous sort I attempted to take our
6ft draft boat in the prior afternoon at 4/5 high tide. No dice. Of
course I was barefully moving so no damage done other than crushing a
few mussels and barnicles.
So while this Inner Sanctum may be theoretically possible to access it
would only be for shoal draft vessels or for those who are willing to
thread a slot of only ten to fifteen feet wide, 25 ft or so from the
eastern shore.