Realbabilu, thank you for posting the announcement about discovery of the CSMU.
A hearty "Atta boy" to the KNKT and everyone on Team Indonesia! The difficult took a few days, the impossible took a little longer.
Here is a close-up of the CSMU shortly after it was located, from video accompanying this Kompas article:
KNKT: CVR Sriwijaya SJ 182 Found After One and a Half Months of Searching
Author Sania Mashabi | Editor Diamanty Meiliana
Kompas.com - 03/31/2021, 13:04
Reports indicate that the CSMU was found by employing the services of the "King Arthur 8", a class of vessel known as a "Trailing Sucker Hopper Dredge" or TSHD. Here is an
image of the ship
Talk about using a huge cannon to swat a fly !! That is in no way a criticism, just an observation about the SCALE of the vessel, relative to the approximately 100mm tall by 100mm OD dimensions of the CSMU.
To get some idea, watch the following YT video:
Considering the large volume of material a TSHD vessel is designed to rapidly process, it is hard to imagine how searchers pored through the contents deposited in the ship's hold.
I doubt there was much that could be done to throttle back the rate of collection fro the seabed - there must be a minimum suction required for effective transport up the pipes. Placing screens over the outlets seems improbable because of the frequency of blockage by crash debris and other solid material.