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https://home.nps.gov/people/hettie-ogle.htm

Hettie moved to Johnstown on 1869 to manage the Western Union telegraph office where she was employed on the day of the flood. Her residence was 110 Washington Street, next to the Cambria County Library. This also served as the Western Union office. Unlike many other telegraph operators associated with messaging on the day of the flood, Hettie was not employed by the Pennsylvania Railroad. She was a commercial operator. Three women were employed by Hettie; Grace Garman, Mary Jane Waktins and her daughter Minnie. They all died in the flood including Hettie.

A timeline of Hettie's activity on May 31, 1889:
7:44 a.m. -She sent a river reading. The water level was 14 feet.
10:44 a.m. -The river level was 20 feet.
11:00 a.m. -She wired the following message to Pittsburgh. "Rain gauge carried away."
12:30 p.m. -She wired "Water higher than ever known. Can't give exact measurement" to Pittsburgh.
1:00 p.m. -Hettie moved to the second floor of her home due to the rising water.
3:00 p.m. -Hettie alerted Pittsburgh about the dam after receiving a warning from South Fork that the dam "may possibly go." She wired "this is my last message." The water was grounding her wires. A piece of sheet music titled "My Last Message" was published after the flood.

Hettie's house on Washington Street was struck by the flood wave shortly after 4:00 p.m.

https://en.wikipedia.org/wiki/Halifax_Explosion

The death toll could have been worse had it not been for the self-sacrifice of an Intercolonial Railway dispatcher, Patrick Vincent (Vince) Coleman, operating at the railyard about 230 metres (750 ft) from Pier 6, where the explosion occurred. He and his co-worker, William Lovett, learned of the dangerous cargo aboard the burning Mont-Blanc from a sailor and began to flee. Coleman remembered that an incoming passenger train from Saint John, New Brunswick, was due to arrive at the railyard within minutes. He returned to his post alone and continued to send out urgent telegraph messages to stop the train. Several variations of the message have been reported, among them this from the Maritime Museum of the Atlantic: "Hold up the train. Ammunition ship afire in harbor making for Pier 6 and will explode. Guess this will be my last message. Good-bye boys." Coleman's message was responsible for bringing all incoming trains around Halifax to a halt. It was heard by other stations all along the Intercolonial Railway, helping railway officials to respond immediately.[71][72] Passenger Train No. 10, the overnight train from Saint John, is believed to have heeded the warning and stopped a safe distance from the blast at Rockingham, saving the lives of about 300 railway passengers. Coleman was killed at his post.[71]