A quote from a blog post on IOTA
The beauty of the Tangle is that you can fluidly branch off and back into the network. This partitioning is key in being adaptive to the rigorous requirements of an asynchronous IoT environment. There is no such thing as always-on connectivity, as such you need to be able to make transactions and secure data even in an offline environment. IOTA makes it possible for a cluster of devices to branch off and still make transactions in an offline environment; utilizing different communication protocols (ZigBee, Bluetooth LE, etc.) for the P2P communication.
Could this be done with datachains in SAFE as well?