Looks like a jurisdiction thing--a Canadian ship launched it though.
The submersible was reported missing after it was overdue by a couple of hours on Sunday evening, according to Chief Mi'sel Joe — head of the Mi'kmaq band which owns the ship from which the submersible is launched.
Maybe they set sail from somewhere in Mass.? Their website appears to be down atm.
Looks like a jurisdiction thing--a Canadian ship launched it though.
https://www.cbc.ca/news/canada/newfoundland-labrador/titanic-submarine-missing-search-1.6881095?cmp=rss