Human remains are believed to have been found within the wreckage of the Titan submersible.
The US Coast Guard says pieces from the Titan submersible, which imploded on a deep dive to the Titanic, were unloaded in St. John's, Canada, on Wednesday.
Officials say the sub's landing frame and a rear cover were found among the debris.
In a statement, the US coast guard said medical professionals will conduct a formal analysis of the presumed remains.
The agency is in the early stages of an investigation into the causes of the disaster.
The Coast Guard's Marine Board of Investigation will transport the evidence to a US port for further analysis and testing.
All five people on board the submersible died on June 18 after it imploded about 90 minutes into a dive to view the famous 1912 Titantic shipwreck, which sits at a depth of 3,800m (12,500ft) in the north Atlantic.
The passengers were the head of OceanGate, which organised the dive, 61-year-old Stockton Rush; British explorer Hamish Harding, 58; Shahzada Dawood, 48, and his son, Suleman Dawood, 19; and French diver Paul-Henri Nargeolet, 77.
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