The migrant boat's situation and the Titanic submersible's situations are not comparable.
There are conflicting reports, per CNN. Some report that the Greek navy was on the scene attempting to stabilize and tow the migrant vessel after its engine broke down. The Greek Navy and Coast Guard deny those accounts, but concede they had vessels on the scene.
https://www.cnn.com/2023/06/18/asia/pakistan-deaths-migrant-boat-disaster-greece-intl-hnk/index.html