British billionaire explorer, Hamish Harding, is on board the Titan, a submersible aiming to explore the wreckage of the Titanic
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Hamish's stepson, Brian Szasz, expressed concern for his stepdad's safety on Facebook during the rescue mission
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Despite the ongoing rescue mission, Brian attended a Blink-182 show in San Diego
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Brian acknowledged that some might find his attendance at the concert inappropriate but explained that being there was important to him as Blink-182 is his favorite band
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The Titan lost communication with the OceanGate Expeditions team about two hours into its descent towards the Titanic wreckage
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The submersible has a limited emergency oxygen supply of 96 hours, which is now estimated to be down to approximately 40 hours
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The current location of the Titan is unknown, and it is uncertain if the five people on board are alive