Bionic Commando (NES)/Neutral Area 17

You will obtain some fairly useful information in this stage. When you approach door A, the soldier who spoke to you from the communication room in will invite you to step inside the door. When you enter, you will see an enemy behind the spikes. He will taunt you, but do not attack him. Instead, find a way to swing over the spikes and visit him. Even if you climb up to the ledge above him, he will talk. Either way, you can knock him with your grappling hook for a few times to force him to talk. Once motivated, he will tell you that there are hidden underground passages running beneath and this area, as well as between  and. Sure enough, when you look at the map, there will now be lines running between those areas.

Last, but not least, head over to door B and step inside. A man standing on the center platform will inform you that they've located Super Joe, and that he is being held in a P.O.W. camp in. This should be your next destination, but before you visit, it is worth taking the time to explore the underground passages that were pointed out. If you explore them, you will find the Iron Helmet item which, like the Pendant, is capable of deflecting shots. However, unlike the Pendant, it works on the first three shots that hit you.