Poland committed a lie of omission because he has a fascination with secret passageways and wished to be the first to discover a relevant one to upstage Lithuania who had formerly discovered a secret room, which Poland himself took issue with.

By my count, you're even. Talk it out at dinnertime.

Regardless, I expect it's clear what happened. Someone's blocked it. After seeing Kanaya be exposed due to the discovery of that passage, they're not taking any chances to allow this one to be discovered.

[And as time is up, Susan will glance around the wine bottles with a sigh.]

We'll investigate further tomorrow.