Mystery holes in western Tokyo farmland, 1945

I. From Chofu, in western Tokyo (Google maps), circa 1945. Source: (GSI)

Noticed these circles or holes in the farms of Chofu, circa 1945. Are these errant bombs? Or just a farming thing? pic.twitter.com/LGrZvTflx7

— the tokyo files (@thetokyofiles) June 7, 2016

Could these be “bomb ponds”?, 爆弾池 (bakudanike)? Or are these merely imperfections or blemishes in the film?

II. In other bomb-related news…”pumpkin bombs” パンプキン爆弾 /  「模擬原爆」 practice bombs

Pumpkin bombs パンプキン爆弾 used to simulate the upcoming atomic bombings; used July 20, 1945 in Fukishima City. https://t.co/rQssQmJhfl

— the tokyo files (@thetokyofiles) July 23, 2016

Links:

Bomb ponds

• Bomb pond photos
• War ruins in Usa, Oita Prefecture
• A supposed bomb pond that is now a fishing site: link
• 鳥栖空襲 Tosu air raid
• Bomb Ponds (2009) – a video and series of photographs that looks at the effects of U.S. bombing operations on Vietnam

Pumpkin bombs

• https://en.wikipedia.org/wiki/Pumpkin_bomb
• https://ja.wikipedia.org/wiki/パンプキン爆弾
• ＜戦後７０年＞模擬原爆「理不尽な死」怒り <After the war 70 years> simulated atomic bomb “wanton death” anger (broken link)