The collapsed wall that was discussed in the Patch Teaser is in the Knorr Queens Lair. The Queen isnt there, and the passage is so far, unpassable. There must be a trigger somewhere.

There is a lever that opens a secret passage (bookshelf) to get back to the top of the research lab dungeon.

One of the pics contain the message when you try to enter the collapsed tunnel.

The tunnel is collapsed here. But from cursory examination it is obvious that hundreds, perhaps thousands, of tiny pincers broke their way through the walls of this long standing facility. The tunnel seems to have collapsed behind whatever crew made their way through the walls.