Very interesting to see how the biology of the sea at that level in that location did not eat away at the ship like what took place with the Titanic, even when that shipwreck was discovered in 1985.
—according to the piece I saw, water temp there is slightly below freezing (due to depth)—that preserved it-
There are similarly preserved, intact 18th and 19th century wooden shipwrecks at much shallower depths in the Great Lakes and, although the wrecks are much older, in the Black Sea.
Critical factors for preservation are very cold water combined with very low oxygen content.
By contrast, although it is much deeper than the Endeavor wreck and in fairly cold water, all the organic materials in and around the Titanic, except tanned shoe/boot leather, are reported to have been consumed by scavengers and microorganisms.