diff --git a/src/underground.py b/src/underground.py
new file mode 100644
index 0000000..a77700e
--- /dev/null
+++ b/src/underground.py
@@ -0,0 +1,109 @@
+import rngtool
+import calc
+import cv2
+import time
+from xorshift import Xorshift
+
+def expr():
+    player_eye = cv2.imread("./trainer/secretbase/eye.png", cv2.IMREAD_GRAYSCALE)
+    if player_eye is None:
+        print("path is wrong")
+        return
+    blinks, intervals, offset_time = rngtool.tracking_blink(player_eye, 870, 680, 85, 90)
+    prng = rngtool.recov(blinks, intervals)
+
+    waituntil = time.perf_counter()
+    diff = round(waituntil-offset_time)
+    prng.getNextRandSequence(diff)
+
+    state = prng.getState()
+    print(hex(state[0]<<32|state[1]), hex(state[2]<<32|state[3]))
+
+    #timecounter reset
+    advances = 0
+    wild_prng = Xorshift(*prng.getState())
+    wild_prng.getNextRandSequence(1)
+
+    advances = 0
+
+    for i in range(100):
+        advances += 1
+        r = prng.next()
+        wild_r = wild_prng.next()
+
+        waituntil += 1.018
+
+        print(f"advances:{advances}, blinks:{hex(r&0xF)}")        
+        
+        next_time = waituntil - time.perf_counter() or 0
+        time.sleep(next_time)
+
+def firstspecify():
+    player_eye = cv2.imread("./trainer/secretbase/eye.png", cv2.IMREAD_GRAYSCALE)
+    if player_eye is None:
+        print("path is wrong")
+        return
+    blinks, intervals, offset_time = rngtool.tracking_blink(player_eye, 870, 680, 85, 90)
+    prng = rngtool.recov(blinks, intervals)
+
+    waituntil = time.perf_counter()
+    diff = round(waituntil-offset_time)
+    prng.getNextRandSequence(diff)
+
+    state = prng.getState()
+    print("state(64bit 64bit)")
+    print(hex(state[0]<<32|state[1]), hex(state[2]<<32|state[3]))
+    print("state(32bit 32bit 32bit 32bit)")
+    print(*[hex(s) for s in state])
+
+def reidentify():
+    print("input xorshift state(state[0] state[1] state[2] state[3])")
+    state = [int(x,0) for x in input().split()]
+
+    player_eye = cv2.imread("./trainer/underground/north/eye.png", cv2.IMREAD_GRAYSCALE)
+    if player_eye is None:
+        print("path is wrong")
+        return
+
+    npcnum = 1
+
+    observed_blinks, _, offset_time = rngtool.tracking_blink(player_eye, 925, 520, 35, 35, th = 0.8, size=20)
+    reidentified_rng = rngtool.reidentifyByBlinks(Xorshift(*state), observed_blinks, npc=npcnum)
+    
+    waituntil = time.perf_counter()
+    diff = round(waituntil-offset_time)+1
+    reidentified_rng.getNextRandSequence(diff)
+
+    state = reidentified_rng.getState()
+    print("state(64bit 64bit)")
+    print(hex(state[0]<<32|state[1]), hex(state[2]<<32|state[3]))
+    print()
+    print("state(32bit 32bit 32bit 32bit)")
+    print(*[hex(s) for s in state])
+    print()
+
+    #timecounter reset
+    advances = 0
+
+    delay = 2
+    wild_prng = Xorshift(*reidentified_rng.getState())
+    wild_prng.getNextRandSequence(1+delay)
+
+    advances = 0
+
+    while True:
+        for _ in range(1+npcnum):
+            advances += 1
+            r = reidentified_rng.next()
+            wild_r = wild_prng.next()
+            print(f"advances:{advances}, blinks:{hex(r&0xF)}", end=" ")
+        print()
+
+        waituntil += 1.018       
+        
+        next_time = waituntil - time.perf_counter() or 0
+        time.sleep(next_time)
+
+if __name__ == "__main__":
+    #firstspecify()
+    reidentify()
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