The French research ship Atalante is almost there:
"It carries the Victor 6000 autonomous robot, capable of descending to a depth of 6,000 metres, beyond the 3,800 metres of the wreck's position"
https://www.reuters.com/world/europe/france-send-ship-titani...
Last I checked on MarineTraffic Atalante was about 100NM away from site. Would it not help?