Comparing Flyhawk DKM Bismarck (2018) and Tirpitz (2025) they introduced new previously unseen features on underwater body.

First: on this picture (Bismarck, top, Tirpitz, bottom on all pictures) in addition to the passive sound detector (horseshoe) one can notice on the left two small protruding edges which mark the forward end of the flat bottom. This is perfectly visible on official plans but never has been reproduced on any kit before AFAIK.



Second: on the aft end the central skeg on Tirpitz is larger and triangular shaped, closely and better matching the pictures of the real ship wreck in 1945



Third: here comes my question. On Tirpitz stem bottom Flyhawk reproduced a recessed feature which looks like another sound detection device, but I've been unable to find pictures of the real equipment and official 1939 plans only show a flush stem;
So is this feature real or not?





BTW, Flyhawk pushed accuracy to represent the numerous openings on hull bottom as per the plan... a rivet-counter aimed feature as 99.9% of assembled kits won't show them: