For decades, it was widely accepted that the propagation of action potential in neurons is unidirectional, down the axon. Since the 1950s, evidence has shown that an action potential can also propagate back through the dendrites sending a retrograde signal to its presynaptic signaling neurons. The backpropagation of action potentials has been extensively investigated in dendrites ever since but less attention has been paid to signal propagation in axons due to widely accepted passive role of axons in signal propagation.In our experiments nerve bundles from the walking legs of lobster, Homarus americanus were used, to investigate the bidirectional propagation of action potentials in axons. Stimulation in ectopic sites on the giant axons results in bidirectional propagation of action potentials. Our results show an asymmetrical propagation of the orthodromical and antidromical signals. The conduction velocity of the signals propagating in both directions were correlated with the stimulation voltage, staying constant or decreasing as a function of the stimulation voltage depending on propagation direction in correlation with the difference in axonal diameter. We interpret our results with the soliton model that assumes a gel phase solitary wave propagating across a fluid phase along the lipid membrane in the axon. The results are in good agreement with the theoretical predictions for the conduction velocity dependence on energy for soliton waves.