Movement script breaks colliders

Hi I augmented the character controller with this(in another c# file) It adds vertical movement but when my player object hits a collider whilst moving in this way it just travels straight through. Can anyone tell me why this is please?

 void playerHoverMovement(){
         if(Input.GetAxis("upDown") >= 0){
             this.transform.Translate(new Vector3(0,Input.GetAxis("upDown"),0)
                 * Time.deltaTime
                 * verticalMoveSpeed
                 * OceanBox.isBelowOceanFloor(oceanBox.playerTransform),
                 Space.World);
         }
         if(Input.GetAxis("downUp") >= 0 /*&& !isAtLevelBounds()*/){
             this.transform.Translate(new Vector3(0,-Input.GetAxis("downUp"),0)
                 * Time.deltaTime
                 * verticalMoveSpeed
                 * OceanBox.isAboveOceanFloor(oceanBox.playerTransform),
                 Space.World);
         }
     }