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Come aboard for a virtual tour of the U.S.’s only surviving steam-powered ocean tugboat Hercules, officials with the San Francisco Maritime National Historical Park urged this week.

The 1907 tug can be explored in a way not possible in person. Steep ladders prevent visitors from accessing some areas, but the new virtual tour allows guests to see the whole ship including the pilot house, the crew’s quarters, and engineering.

A downloadable app employs VR technology to give visitors a unique look inside the 1907 steam-powered tugboat Hercules. It includes historical images and facts about the vessel that once plied the waters of San Francisco Bay. (Image courtesy of Google Play)

Hercules represents the height of 1907 marine steam reciprocating technology, according to national park officials, as well as the strength and fortitude of the sailors she carried.

Up to 17 sailors were aboard Hercules with little privacy while facing long bouts of boredom and terrifying storms.

Voyages usually lasted a week or two and could last a month or longer, national park officials said.

Visitors will need a free app for the tour, which can be downloaded from the App Store or Google Play. More information about the project is available online.