On Tuesday, the U.S. Coast Guard said the fire started with a leak in a fuel-oil return line running from one of the ship's engines.

CNN: STORY HIGHLIGHTS

Carnival said the ship's emergency diesel generator failed, but the cruise line disputed notions of a widespread system failure.

CNN: STORY HIGHLIGHTS

If a cruise ship crew member negligently kills one of these passengers, the cruise line is liable for funeral expenses and nothing more.

CNN: My son's grieving family deserves more from BP

As a naval line officer, the commanding officer of a carrier is given broad responsibility for his ship.

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