RedactedNarrative: On 7/9/2020 at approximately 1600 Subject was aboard his vessel at Gallatin Marina when he witnessed smoke coming from V4 (Hilburn Houseboat 0078DV). He then called 911 and began cutting nearby dock lines to separated vessels from the fire. At 1645 I responded to a Marina fire at Gallatin Marina. 12 vessels are known to have been damaged or destroyed. Gallatin Fire Dept investigated the origin and source of the fire. Their report is included in the case file. Specific cause of the fire is unknown.