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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.
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CodeRabbit
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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/
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https://jami.net/ as well, but I'm unsure if it works through bluetooth.
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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
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.