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Mon Oct 12, 2020, 08:02 AM

Poland evacuates 750 people as WWII Tallboy bomb is defused

Source: AP

WARSAW, Poland (AP) — Hundreds of people in northwest Poland have been evacuated for a few days to allow Navy sappers to neutralize a British World War II giant Tallboy bomb resting under a waterway leading to the port of Szczecin.

The 5.4 ton bomb was found in Sept. 2019 during work to deepen the waterway. It’s located on the southern edge of a popular Baltic Sea resort of Swinoujscie, that, like Szczecin, was a busy Nazi Germany military port during the war.

In a defusing project that began Monday and is expected to last for five days, experts will be seeking to neutralize the Tallboy underwater by causing its explosives to burn out in a controlled way.

It is believed to be the first such underwater operation on a Tallboy, which have previously been neutralized on land in Germany, Norway and France.

Read more: https://apnews.com/article/szczecin-world-war-ii-poland-germany-archive-4c1fca90e913fd39256f382f83696fd9

13 replies, 1496 views

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Reply Poland evacuates 750 people as WWII Tallboy bomb is defused (Original post)
Omaha Steve Oct 12 OP
Sherman A1 Oct 12 #1
soothsayer Oct 12 #2
AllaN01Bear Oct 12 #3
DetroitLegalBeagle Oct 12 #4
ffr Oct 12 #5
krispos42 Oct 12 #6
JustABozoOnThisBus Oct 12 #7
ProfessorGAC Oct 12 #8
ripcord Oct 12 #9
ProfessorGAC Oct 12 #10
ripcord Oct 13 #12
ProfessorGAC Oct 13 #13
Eugene Oct 13 #11

Response to Omaha Steve (Original post)

Mon Oct 12, 2020, 08:07 AM

1. Wow

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Response to Omaha Steve (Original post)

Mon Oct 12, 2020, 08:07 AM

2. Jeez, I wish them good luck!

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Response to Omaha Steve (Original post)

Mon Oct 12, 2020, 08:08 AM

3. eep.

we will keep finding those thing till kingdome come , ww1 and 2.
https://en.wikipedia.org/wiki/Tallboy_%28bomb%29
https://www.pbase.com/image/116385627

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Response to AllaN01Bear (Reply #3)

Mon Oct 12, 2020, 08:47 AM

4. Yep

Even over 100 years later, farmers still find World War 1 shells every year when they plow their fields. France still has "no go" zones where no one is allowed to step foot in because there are still a lot of unexploded ordnance left over from the wars. I think I read around 3 million tons were dropped in Europe in WW2 alone.

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Response to Omaha Steve (Original post)

Mon Oct 12, 2020, 10:25 AM

5. Analogy: tRump's the bomb and the voters are the ones trying to nullify him.

I suppose in the totality about the defusing process, it would only take a small amount of explosive to kill the defuser. So what's another few tons, right?



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Response to Omaha Steve (Original post)

Mon Oct 12, 2020, 11:29 AM

6. Yikes

The term "blockbuster" was originally applied to bombs like these because they could devastate an entire city block.

On the plus side, if the XOD people make a mistake, none of them will feel a thing.

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Response to Omaha Steve (Original post)

Mon Oct 12, 2020, 03:58 PM

7. EOD consultant (from desk): Just light the explosive; it should burn at a slow, controlled, rate.

EOD operator (in big suit and carrying tools): Whaaaaaat?

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Response to JustABozoOnThisBus (Reply #7)

Mon Oct 12, 2020, 05:07 PM

8. That's What I Would Do, Too

I worked as a consultant with ACE and EOD folks decommissioning an arsenal back in the 90s.
None of the obsolete ordinance was this old though.
It was mostly late Vietnam war ordinance.
Several hundred 105 rifle shells, thousands of spinnerettes, and a couple hundred 500 pound PETN aerial bombs.
We set them off in time controlled detonations.
But, handling 25 year weapons using PETN or HMX is way different than a 5 ton, 80 year old tetril or TNT based device. The latter 2 are more stable over time, and they were 1/4th the age.
Maybe the tools were to remove the trigger and expose the high explosive for combustion.
I would take your suggestion in a heartbeat. Just combusting it is way safer than defusing and moving that thing.

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Response to ProfessorGAC (Reply #8)

Mon Oct 12, 2020, 06:35 PM

9. I make composite rocket motors

As long as the propellant isn't contained it just burns but I don't deal with 65 year old motors.

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Response to ripcord (Reply #9)

Mon Oct 12, 2020, 07:02 PM

10. What's The Chemical Composition Of Your Motors?

Just curious.
At an ACS convention, years ago, I was at the dinner with a chemist what is now RocketDyne. They were a primary manufacturer of the propellant of the Shuttle booster.
He was a strong chemist & a good guy.
Now, that's a rocket motor, huh?

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Response to ProfessorGAC (Reply #10)

Tue Oct 13, 2020, 03:55 PM

12. Pretty much the same as the shuttle's solid rocket boosters

Ammonium perchlorate, R45 HTPB binder, some aluminum powder and a little red iron oxide is the main composition. Everyone needs a hobby.

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Response to ripcord (Reply #12)

Tue Oct 13, 2020, 04:24 PM

13. That's Cool!

Have fun!

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Response to Omaha Steve (Original post)

Tue Oct 13, 2020, 01:12 PM

11. WW2 'earthquake' bomb explodes in Poland during attempt to defuse it

Source: BBC

WW2 'earthquake' bomb explodes in Poland during attempt to defuse it

13 October 2020

The largest unexploded World War Two bomb ever found in Poland has detonated during the defusing process, a Polish Navy spokesman said.

The chance the bomb - at the bottom of a Baltic Sea shipping canal - would detonate had been put at 50-50 and all the divers were unharmed.

About 750 residents had been evacuated near the port city of Swinoujscie.

The RAF dropped the Tallboy or "earthquake" bomb in a raid in 1945 which sank the German cruiser Lützow.

Swinoujscie was part of Germany and called Swinemünde at the time of the bombardment.

The shock of the latest detonation was reportedly felt in parts of the city and a video shows the blast throwing up a large column of water into the air.

-snip-


Read more: https://www.bbc.com/news/world-europe-54522203


Tallboy bombs were dropped by RAF Lancaster bombers

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