If superintelligence can be achieved, I'm pessimistic about the safe part. - Sandboxing an intelligence greater than your own seems like an impossible task as the superintelligence could potentially come up with completely novel attack vectors the designers never thought of. Even if the SSI's only interface to the outside world is an air gapped text-based terminal in an underground bunker, it might use advanced psych…
Maybe the only way to avoid an unsafe superintelligence is to not create a superintelligence at all.