Canada’s Transportation Safety Board has started its investigation into the operator of the Titan submersible, with authorities boarding the Canadian-flagged launch ship the Polar Prince. The probe started the day after the US Coast Guard said the vessel had likely suffered a “catastrophic implosion”, killing 5 passengers, including OceanGate’s co-founder Stockton Rush. Since parts were found scattered on the seafloor near the wreck of the Titanic, reports have come to light that Seattle-based OceanGate rejected feedback when issues were raised over the Titan’s homemade-style construction. And more of the victims’ families have spoken, including Azmeh Dawood – the sister of British-Pakistani businessman Shahzada Dawood and aunt of 19yo Suleman. She said her nephew felt “terrified” about the trip but was eager to please his dad.