How could a submarine-like vehicle steer and propel itself in a superfluid?

In a large body of liquid helium below the lambda point, what would be the best way(s) for submarine like vehicles to achieve acceleration and directional control?

I'm willing to accept an answer that invokes a way round the problem, such as intentionally heating helium over the lambda point, as long as it is reasonably justified as a practical solution.

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How could a submarine-like vehicle steer and propel itself in a superfluid?

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