Movie director and submersible maker James Cameron said on Thursday he wishes he had sounded the alarm earlier about the submersible Titan that imploded on an expedition to the Titanic wreckage, saying he had found the hull design risky.

All five aboard the vessel were killed.

Cameron became a deep-sea explorer in the 1990s while researching and making his Oscar-winning blockbuster "Titanic," and is part owner of Triton Submarines, which makes submersibles for research and tourism.

He is part of the small and close-knit submersible community, or Manned Underwater Vehicle (MUV) industry. When he heard, as many in the industry had shared, that OceanGate Inc was making a deep-sea submersible with a composite carbon fiber and titanium hull, Cameron said he was skeptical.

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