"At helm" refers to being in control or in charge of a situation. Its antonyms would be terms that convey the opposite meaning of losing control or no longer being in charge. Some possible antonyms might include "out of control," "disorganized," "chaotic," "in disarray," "leaderless," "unguided," "uncontrolled," "unstructured," "directionless," "aimless," or "rudderless." These words suggest a lack of direction or purpose, a state of confusion or disorder, or a situation where no one is taking responsibility for decision-making. In contrast to being at helm, these antonyms imply an absence of leadership or a failure to effectively manage a situation.