Why Are These Ships Designed To Sink?

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✩ABOUT THIS VIDEO✩
In this video, we look at how semi-submersible heavy lift vessels are used to transport cargo around the world when it is too heavy to be lifted by any crane.
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[@qihengng5993]

a ship shipping ship, shipping shipping ships

[@Ky-kx2hd]

Can you do one about those semi-submersible vessels that turn sideways? Like, the bow points upright when it's deployed? That's some crazy engineering.

[@frederiknielsen6038]

Occationally, these ships will show up on radar as two seperate echoes if they are large enough. This can lead to a few minutes of head scratching as you try to figure out what exactly you are looking at.

[@awmperry]

We had one of these - Zhen Hua 33 - in Stockholm in 2020 when a new bridge was being delivered from China. It was assembled on two barges, floated aboard and welded to the deck, and transported all in one piece. I was posted to guard her quay during her visit - impressive boat.

[@gammondinosaur3411]

AITCH, AITCH, AITCH 🤬

[@joerivanlier1180]

Ships designed to sink, I thought this would be about the Russian navy. But this is fine too...

[@LPRD]

Perhaps interesting to mention that both the blue marlin and Vanguard are owned by one company, (dockwise), now part of Royal Dutch Boskalis. I love these kinds of niche ships

[@everythinglakefreighters47]

Can you guys do a video on how the design of Lake freighters on the Great Lakes have changed throughout the decades? Would make for an awesome video

[@andreseriliano1761]

This could have save Titanic, if the technology was invented years prior to its maiden voyage.

[@turbooggyboy]

They actually used one of these to transport a bridge from China to Stockholm, which took the ship through the Stockholm archipelago to drop the bridge onto barges near the city center, which then allowed for the bridge to be pushed into place.

[@medea27]

For me, the most impressive moves the semi-submersibles make are the oil rigs... out of the water they are so tall & wide with such a high centre of gravity that it looks like a truck carrying a 6-storey office building on the trailer! The forces that all that steel resists are truly mind-boggling.

[@charliescott7764]

The other application is to substitute for dynamic launches of ships. HMS Glasgow Type 26 Anti Submarine frigate was recently skidded onto a barge at Govan on the Clyde, towed to Loch Long, floated off and taken back to Scotstoun for filling out. Dynamic launches are much more dramatic but also stressful to the hull.

[@mandez3498]

I was fortunate enough to spend a week on the HMAS Adelaide and seeing the Canberra brought back great memories. Thank you again to the the Australian Navy!!

[@xmarksthespot6699]

"moving ships is just a side hustle for them" damn that was badass

[@bigutubefan2738]

Great video, as ever! I'd be fascinated to see how the calculations work to show the centre of buoyancy is still below the combined centre of mass when lifting/pumping out starts, and any effect on the GM moving due to the ballast tanks (the same effect from sloshing, as in your "Potatoes almost Capsized this ship" video (Commodore Clipper), the free surface effect inside ballast tanks that are only partially filled).

[@sereminar4]

That's so rediculously cool!!!!

[@pakoize]

Thank you, when I was a child my grandfather instilled a love for sea and ships trough series of stories and books. But then life happened and I found more profitable ventures. Casual Navigation you have been a God sent and rekindled that old passion and interest

[@sirBrouwer]

i have worked on one of the two semi's from Big Lift. while it was in port. they were actually working on two at the same time as they. the two sister ships would have to be work in tandem. it was even for them a new thing. they only needed to be able to lift the actual platform out of the water and (the reason as to be in tandem side by side) sail so that they could sail above the tower part.

[@mortified776]

It's worth mentioning that the load is welded to the heavy lifter's deck after being raised and is cut free before refloating. Needless to say, with this kind of load the risk of it coming lose while underway needs to be as close to zero as humanly possible!

[@Arthur_da_dog]

Man, your channel has gotten so far. Having been following you since your very early days (<5k subs), and seeing the quality of the content you put out, I love it. Keep it going strong!