Highlights from the Seventh Episode of Season 2 of Under The Dome

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions, on UNDER THE DOME. Photo: Brownie Harris/CBS©2014 CBS Broadcasting Inc. All Rights Reserved.

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions, on UNDER THE DOME. Photo: Brownie Harris/CBS©2014 CBS Broadcasting Inc. All Rights Reserved.

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions, on UNDER THE DOME. Photo: Brownie Harris/CBS©2014 CBS Broadcasting Inc. All Rights Reserved.

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions, on UNDER THE DOME. Photo: Brownie Harris/CBS©2014 CBS Broadcasting Inc. All Rights Reserved.

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions.

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions.

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions.

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions.

When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions.