In Pothole Pete, you are marked as dead with a
  ld (ix+10),1

The .mtx file has this sprite collision test
0x47fc : @db02     in	   a,(0x02)
0x47fe : @cb6f     bit     5,a
0x4800 : @2804     jr      z,0x4806
0x4802 : @dd360a01 ld      (ix+0x0a),0x01     <-- +0x3ac7 = 0x82c9

Not sure what kind of death this is
0x4833 : @dd360a01 ld	   (ix+0x0a),0x01     <-- +0x3ac7 = 0x82fa

This appears to be the spiky bush death
0x4ef1 : @dd360a01 ld      (ix+0x0a),0x01     <-- +0x3ac7 = 0x89b8

This appears to be the falling too far death
0x4f4c : @dd360a01 ld      (ix+0x0a),0x01     <-- +0x3ac7 = 0x8a13

This is where air is reduced
Can't disable this as it is necessary to progress to next level
0x5063 : @dd3516   dec     (ix+0x16)          <-- +0x3ac7 = 0x8b2a

This is the running out of air death
Can't disable this as it is necessary to progress to next level
0x5085 : @dd360a01 ld      (ix+0x0a),0x01     <-- +0x3ac7 = 0x8b4c

Pothole-hacked.mtx has these patched.
I patch the first 4 kinds of death so that they refill your air instead.
Note that the air bar doesn't redraw to reflect this.
