To halt its descent a diving submarine might?

To halt its descent, a diving submarine might adjust its buoyancy by taking on water into its ballast tanks or expelling water to become more buoyant. It could also increase its speed by using its propellers to generate lift, or angle its bow upward to reduce downward momentum. Additionally, activating the submarine's control surfaces, such as the stern and bow planes, can help manage its depth and stabilize its ascent.