UMs: Miscellaneous non-murder stuff

So, without perusing the r/unresolved mysteries subreddit again after having done so for the previous posts, I came across a new sister-subreddit called r/nonmurdermysteries, which is just the kind of stuff I like most of all. There's no real theme here other than that, so slap on that rockin' theme song again and read on:

NASA developed a 10 million dollar, star studded movie in participation with a Taiwanese animation studio about the Cassini-Hyugens mission to Saturn, but seems to have been lost somehow:
https://www.reddit.com/r/nonmurdermysteries/comments/kdyxo0/what_happened_to_nasas_10_million_dollar_movie/

An unmanned, solar powered spy boat washed up near Scotland and nobody knows who it belongs to:
https://www.forbes.com/sites/davidhambling/2020/10/07/mystery-deepens-around-unmanned-spy-boat-washed-up-in-scotland/?sh=7d5d706a541f

I talked about the Amber Room before, but now there are people thinking that a wreck near Poland may contain the remains:
https://www.theguardian.com/world/2020/oct/01/nazi-shipwreck-found-off-poland-may-solve-amber-room-mystery?utm_term=Autofeed&CMP=fb_us&utm_medium=Social&utm_source=Facebook#Echobox=1601571129

I remember reading the articles by Ning Li in Popular Science back when they came out about antigravity, but now it seems no one knows where they are anymore: 
https://www.youtube.com/watch?v=eS_rEzKdzBA

A canyon guide near Escalante, Utah was sent to check on a strange occurrence in the bottom of a difficult canyon in BFE, found weird belongings and gear, but no people, no clue what happened, and no resolution:
https://www.reddit.com/r/nonmurdermysteries/comments/ollssk/i_was_a_canyoneering_guide_and_on_volunteer/

A house renovation in Ohio suddenly reveals suitcases full of money, a hidden room, safe, and a pile of vhs tapes (wish I had that problem). 
https://www.reddit.com/r/nonmurdermysteries/comments/hn67yt/renovated_house_in_ohio_reveals_suitcases_full_of/

The title says it all, a student discovers 5,000-year-old short sword hidden in Venetian monastery:
https://www.livescience.com/ancient-anatolian-sword-in-venetian-monastery.html