In these spots bomb is impossible to get whatever you do.

• Hay Bales[puu.sh]
  
• Crate next to the wooden scaffolding[puu.sh]
  
• Barrels behind tree[puu.sh]
  
• Scaffolding at CT spawn if bomb falls through planks[puu.sh]
  
• Entire are behind and under the table on CT spawn[puu.sh]
  
• All the crates in the upper section of the map (2 balconies)[puu.sh]

In these spots you can get the bomb back but only with the help of teammate so it's impossible to get the bomb if teammate is a troll.

• Scaffolding at CT spawn if bomb doesn't fall through planks[puu.sh]
  
• Metal Gate at T spawn[puu.sh]