A base banjo, to be precise.
It is huge. Huge enough to hide under during an airstrike.
““It was in a banjo band that went to the First World War to entertain the troops.
“The bloke who was playing it was called Wally Ogden and it actually got buried after the bunker got hit by a shell and they thought the banjo was lost.
“When they dug it all out again they found the tunnel was still there and they managed to get the banjo back, so it’s been through the wars.””
That makes my pun make sense now (I didn’t post the quote first time around…).