What secret way, unknown to any other, had led him into this Stygian realm?

Further, these atoms interact with each other and their environment in unknown ways.

I have no doubt it reveals his identity, in some way unknown to us.

In some way, unknown to myself, I was a menace, a danger!

Finally, there is a group of proteins which are related to the activation in an unknown way.

The character of the field man's work was fundamentally altered in ways unknown to younger staff.

Also I have the homing sense which before led me through unknown ways.

In an unknown way, they improve the functioning of the cholinergic system.

Such transmission afterwards became associated in some unknown way with pleasure or pain.

So your ships go into battle fearing defeat in some unknown way.