The Claw of Archimedes (Ancient Greek: Ἁρπάγη, romanized: harpágē, lit. 'snatcher'; also known as the iron hand) was an ancient weapon devised by Archimedes to defend the seaward portion of Syracuse's city wall against amphibious assault. Although its exact nature is unclear, the accounts of ancient historians seem to describe it as a sort of crane equipped with a grappling hook that was able to drop and partly submerge an attacking ship down into the water, then either cause the ship to capsize or suddenly let it go altogether. It was dropped onto enemy ships, which would then swing on to defensive forces and destroy them.
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The plausibility of this invention was tested in 1999 in the BBC series Secrets of the Ancients and again in early 2005 in the Discovery Channel series Superweapons of the Ancient World. The producers of Superweapons brought together a group of engineers tasked with conceiving and implementing a design that was realistic, given what is known about Archimedes. Within seven days they were able to test their creation, and they did succeed in tipping over a model of a Roman ship so that it would sink. While this does not prove the existence of the Claw, it suggests that it would have been possible.
https://en.wikipedia.org/wiki/Claw_of_Archimedes
To @[email protected]: It would be useful if you would just copypaste some basic info, or a link to wikipedia on posts like this. Not everyone have such a huge knowledge of history like you, some historical context would help understand what exactly visible on the image.
E.g. in this case this image is purely speculation, as we don't have any remains or drawings of these machines to reconstruct it from, only some textual descriptions.