The state ferry dock in Skagway, Alaska, was brought back to the surface Tuesday night.

The Alaska Marine Highway System says testing and inspection of the dock must be done, so ferry service to Skagway will remain cancelled until next Friday.

Skagway dock

The Skagway dock is normally used to load passengers and vehicles onto Alaska Marine Highway System ferries. On Thursday morning, people in the community woke up to find it underwater. (Tim Authier/Facebook)

Engineers say a line that runs under the dock to supply water to the ferry ruptured and flooded concrete flotation chambers under the structure.

"From the engineers we've learned that that's what they believe caused this situation," said Skagway's municipal manager, Scott Hahn. "It does not appear to have sustained any structural damage and we believe it will be back in service next week so we are very excited about that."