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Twitter screenshots David Pogue: Remember my voyage to the Titanic last last summer? In OceanGate’s homemade carbon- fiber subThey took passengers out again this summer —but as of today, the sub is lost. Coast Guard is doing a search and rescue. Tom: Do submersibles have something similar to an aircraft's Emergency Locator Transmitter (ELT) that could be detected by searchers? David Pogue: This submersible does not have any kind of beacon like that. On my expedition last summer, they did indeed get lost for about 5 hours, and adding such a beacon was discussed...