You destroyed the device but it did not stop the incoming water. The current is now so strong that it blew you back into the trapped room and you only have a few moments to decide what to do.

Examine the mural, fast.

Attempt to open the small door, fast.

Strict Mode (In Strict Mode, the game will not show you options that require a skill you do not have. In non-strict mode, these options will be greyed out but you can still cheat and access them. You can switch modes at any time.)