With a quick boost from the giant, Owen clambers to the top of the stone block. He asks for the sunrod to get a better look at the squeeze he is about to try and get through and what might await him beyond it.
Beyond the block, a 10 foot-wide corridor stretches almost to the end of the sunrod's illumination, marked by dual 5 foot-wide alcoves placed every 10 feet or so. The corridor eventually leads to a larger room whose exact dimension are shrouded in darkness. A faint wind seems to play within the passage, but it's difficult to tell where it's coming from. As far as Owen can see, the corridor and the room beyond it are empty, and no other dangers seem immediately apparent.
Handing the sunrod back to its owner, Owen now tries to fit himself through the opening (OOC: Escape Artist check 4 + 3 = 7, failure) but is unsuccessful at navigating the choke point. Undeterred he gives it another try (OOC: Escape artist check 18 + 3 = 21, failure) but once again gets a body part caught. The squeeze seems impassable.
(OOC: Owen believes that not even "taking 20" would help him get through this tight space. Someone of small size might have more luck, however, as would someone with a higher Escape Artist score.)