Eruptions from Mauna Loa have not always occurred on the Big Island. As, in historic time, a submarine volcanic eruption nearly caused a disaster which was averted by quick thinking of a ship captain. Upon further analysis, this submarine eruption of Mauna Loa which was witnessed was not an isolated event, as at least half a dozen such below sea level eruptions have occurred in the same general area in the last 100,000 years.
Thumbnail Photo Credit: NSF and NOAA, NOAA Photo Library, Public Domain, https://photolib.noaa.gov/Collections/Voyage/Other/emodule/1340/eitem/78280. This image was then overlaid with text in addition to GeologyHub made graphics (the image border).
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Various licenses used in sections of this video (not the entire video, this video as a whole does not completely fall under one of these licenses) and/or in this video's thumbnail image:
Public Domain: https://creativecommons.org/publicdomain/mark/1.0/
 U.S. Geological Survey
 Hawaiian Volcano Observatory
 U.S. Geological Survey, Hawaiian Volcano Observatory article which this video directly quoted from: https://www.usgs.gov/news/volcano-watch-steamer-passenger-recorded-unusual-eruption
0:00 Mauna Loa's Eruption
1:08 1877 Submarine Eruption
2:41 Prehistoric Submarine Vents
3:29 Other Submarine Eruptions