List of Sub Tank locations

Here is the list depicting where the various Subtanks (and other related items) in the Mega Man X series onwards are located.

Mega Man X

 * Storm Eagle: In the first part of the area where there are platforms rising up and down. Use the platforms to reach a tower to the left. The subtank is inside the tower; shatter the glass to get inside.
 * Spark Mandrill: At the beginning of the stage, there are two paths, one leading up and another down, then forward. Follow the latter path to a dead end, and use an aimed Boomerang Cutter to nab the subtank on the other side of the wall.
 * Flame Mammoth: Found in the same large room the Heart Tank was found. Make your way to the top of the platforms and head to the left past some Mettools. At the end is an extra life, and you'll find the Sub-Tank if you jump from here and climb up the left wall. Use the armor's foot upgrade to break through the blocks.
 * Armored Armadillo:After dropping down into the mines, a drill-like enemy with spikes will break through a rock wall and chase after you. Hang around on the wall and allow it to pass you, and explore the cubby where the tank was to find the Sub-Tank.

Mega Man X2
stay on the highest set of platforms to find the Sub-Tank on the last one.
 * Flame Stag: In the very beginning of the stage, there's a large hornet robot that you're supposed to trick into ramming the breakable blocks. Instead, lure it up to the top of the mountain, and use its back as a platform to jump to the otherwise-unreachable cliff on the left. The Sub-Tank is sitting against the wall on a ledge.
 * Bubble Crab: Following the area where the heart tank is, drop down into a similar section of the stage with more robotic jellyfish. Using a charged Bubble Splash, which allows you to jump higher underwater, jump up to a small spot in the middle of this area that's above water. X will just break the surface, and you can actually jump on the surface if you press the B-Button as you're about to land. With this in mind, the Sub-Tank is on a ledge to your left.
 * Magna Centipede: After the puzzles involving the large blocks that move around and try to crush you, you'll see a small gap in the ceiling with a bit that sticks out, begging to be climbed up. Stand on the raised platform just off screen to the left and perform an air-dash coupled with a charged Speed Burner to reach it.
 * Wire Sponge: After passing the first weather control orb, stand on the first platform and air-dash to the left wall. Follow this up and

Mega Man X3
the far right corner, so use the platform-insect to reach it. Alternatively, you can also use the enhanced boots and perform air-dash up to it. down. Head up top first and jump into a Ride Armor when you find the Ride Armor platform. Now return to the vertical tunnel and jump down. When you reach the bottom, the Ride Armor's mass will cause the floor to crumble beneath you. Follow this new path to a hidden room where you'll find the Sub-Tank and some energy capsules.
 * Neon Tiger: Near the beginning of the stage, there's an open area with the insects that you can stand on. Though you can use them to bypass the second level, climb up the right wall and destroy the red robot that swings a mace at you. The Sub-Tank is directly above you in
 * Blizzard Buffalo: This subtank is in plain sight above you as soon as you enter the last open area before the boss. Use the foot parts' (conveniently found in another part of the area) upward dash to reach the subtank.
 * Tunnel Rhino: In the part of the tunnel where columns of dirt are dropped on you and the moving platforms, the Sub-Tank is in the far right corner. You're supposed to drop down a series of steps, and you'll probably spot it as you're going. Simply jump to the wall and climb up to obtain it.
 * Volt Catfish: Beyond the room where you fight Bit or Byte, there's a long vertical passage with orbs of electricity running up and

Mega Man X4
Weapon Tank: in Area 2, at the top in the last column of cube of ice. EX Tank: in Area 1, above the disappearing slopes with spikes. Climb the wall to the right, and use Lightning Web to reach the tank on
 * Jet Stingray: Area 2 above some platforms.
 * Cyber Peacock: achieve Rank S during the second "test" of Area 1.