A Russian airstrike pummels a maternity and children's hospital in the besieged Ukrainian city of Mariupol, sending people running for their lives. What's left of the facility, as pressure mounts on the West to intervene. Fears are growing about the nuclear power plant facilities in Chornobyl and Zaporizhzhia. What's at stake and what nuclear experts are watching for. Also, the changing face of the pandemic: more provinces are dropping mask mandates and other public health measures. Plus, the causes of British Columbia's overdose crisis and the possible solutions. And a mystery solved after more than 106 years: where polar explorer Ernest Shackleton's Endurance ship has finally been found.