The archives of the New York Times are a great source for articles written from the mid-19th century through the early 21st, and you can find current New York Times articles in the News & Newspapers database as well as many other national and international papers.
Look for national and international news along with legal documents like court opinions and federal codes in Nexis Uni.
These investigations occur not just because they're helpful in preventing future accidents but because they are required by the United Nations Convention on the Law of the Sea for all member nations: