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berty
Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network
I am not an expert or anything close, but i downloaded this one https://www.servalproject.org/ and it seem to work. The technology exists for a while now so there are meany implementations of it if this one dosent work out.
If there is at least limited internet access (heavily filtered, but not cut off), it is also likely that Tor will work: https://www.torproject.org/download/
https://jami.net/ as well, but I'm unsure if it works through bluetooth.
https://berty.tech/ and https://briarproject.org/ are other options. Both claim to work through Bluetooth if necessary. I no experience with either, but seems promising.