This is consistent with this video of a trip. Comms were lost, and the pilot even jettisoned some of the ballast in order to resurface. They continued the desce

This is consistent with this video of a trip. Comms were lost, and the pilot even jettisoned some of the ballast in order to resurface. They continued the descent later though. https://m.youtube.com/watch?v=RAncVNaw5N0 https://m.youtube.com/watch?v=RAncVNaw5N0