Tunnel 
To dream of a tunnel represents the main female reproductive organ, the womb, and giving birth. Hence, it may indicate your need for protection and nurturing.
To dream that you are going through a tunnel suggests that you are discovering parts of your unconscious. You are in the process of gaining understanding and enlightenment. Alternatively, it may indicate your myopic nature.
To see light at the end of the tunnel symbolizes hope and a brighter future.
Subway
To dream that you are in the subway implies that you are attaining your objectives without having to use much physical effort. You are discovering your inner spirituality and personality. It may also mean that you are being too impulsive and you should think carefully before making a decision.
Inner Tube
A dream about floating in an inner tube indicates that you feel you are on a path controlled by your emotions.
To dream of going with the flow in an inner tube indicates that you are comfortable following your emotions.
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