Experts on Tuesday boarded the massive container ship that had blocked Egypt’s vital Suez Canal and disrupted global trade for nearly a week, seeking answers to a single question that could mean billions of dollars in legal implications: What went wrong?

As convoys of ships again began travelling in this artery linking East and West through the Mediterranean and Red Seas, hundreds more idled waiting for their turn in process that will take days. Egyptian government officials, insurers, shippers and others similarly waited for more details about what caused the skyscraper-sized Ever Given to become wedged across the canal’s southern single-lane on March 23.