The CVR of Lion Air JT-610 was found at 09:10 Jakarta time [0210Z - Airbubba], 8 meters below the seafloor, or 30 meters deep,” said Indonesian Navy Spokesman Colonel Liutenant Agung Nugroho
Assuming the CVR was in the tail, locating it 8 metres below the seabed reinforces the vertical speed of impact.
Also assuming no beacon signal for weeks, it is pretty impressive that they found it.
I am interested to know how they went about the search.