The Derna flooding loss of life could reach 20,000 as per the city's chairman.
Whole areas vanished into the ocean as an enormous wave like deluge of water cleared the port city in eastern Libya.
Record precipitation
The water was brought by Tempest Daniel which hit Libya on Sunday.
The tempest - a Mediterranean storm like framework known as a medicane - brought more than 400mm of downpour to parts of the north-east coast inside a 24-hour time span.
That is a phenomenal downpour of water for a district which typically sees around 1.5mm all through the entire of September.
Libya's Public Meteorological Center says it is another precipitation record.
Satellite information shows the degree of a portion of the precipitation across the locale - albeit in many puts the sum recorded on the ground was higher.
It's too soon to ascribe with assurance the seriousness of this tempest to climbing worldwide temperatures.
Nonetheless, environmental change is believed to be expanding the recurrence of the most grounded medicanes.
Prof Liz Stephens, a specialist in environment dangers and versatility at Perusing College in the UK, says researchers are certain that environmental change is supercharging the precipitation related with such tempests.
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Two dams overpowered
The Watercourse Derna waterway runs from Libya's inland mountains, through the city of Derna and into the Mediterranean.
It is dry for a large part of the year, however the strangely weighty downpour overpowered two vital dams and obliterated a few scaffolds.
Occupants of the city, who had been requested by the neighborhood specialists to remain in their homes, revealed hearing a boisterous impact before the city was immersed in water.
"The dams would have kept down the water at first, with their disappointment possibly delivering all the water in one go.
"The flotsam and jetsam got up to speed in the floodwaters would have added to the horrendous power," says Prof Stephens.
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The upper dam had a capacity limit of 1.5 million cubic meters of water, while the lower dam could hold 22.5 million cubic meters.
Each cubic meter of water weighs around one ton (1,000kg), so 1.5 million cubic meters of water would weigh 1.5 million tons.
Join that load with moving downhill, and it can deliver gigantic power. Witnesses have said that the waters were almost three meters in places.
It is assessed that six inches (20cm) of quick rising water is sufficient to knock somebody off their feet, and 2ft (60cm) is sufficient to drift a vehicle. So it is nothing unexpected that entire structures were taken out in the flood.
Specialists say it's too soon to know whether the outrageous precipitation was essentially a lot for the dams to deal with, or whether the state of the designs likewise assumed a part.
In view of their perceptions, the dams are probably going to be produced using unloaded and compacted soil or shakes, which isn't quite areas of strength for so concrete.
"These dams are vulnerable to overtopping [when water surpasses a dam's capacity], and keeping in mind that substantial dams can endure overtopping, rockfill dams normally can't," says Exeter College's Prof Dragan Savic, a specialist in pressure driven designing in the UK.
Apparently the upper dam bombed first, as indicated by primary architect Andrew Barr.
He says the water then, at that point, presumably streamed down the rough waterway valley towards the lower dam prior to overpowering it, bringing about the abrupt and horrendous flooding of the city which falsehoods caught among mountains and the ocean.
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An examination paper distributed keep going year on the hydrology of the Channel Derna Bowl featured that the region "has a high potential for flood risk", based on logical verifiable flood volumes, and that the dams "required intermittent support".
The report, by structural designing master Abdelwanees AR Ashoor from Libya's College of Omar Al-Mukhtar, said that "the ongoing circumstance in the Derna valley bowl expects authorities to go to prompt lengths, doing standard support of the current dams, in light of the fact that in case of a tremendous flood, the outcome will be sad for the occupants of the valley and the city".
A few specialists play featured the conceivable part that the political shakiness in Libya has played in the upkeep of the dam.
As salvage endeavors in the city proceed, Libyan columnist Johr Ali, who has addressed survivors in the city, told the BBC: "Individuals are hearing the calls of children underground, they don't have the foggiest idea how to get to them.
"Individuals are utilizing digging tools to get the bodies from under the ground, they are utilizing their own hands. They all say it's like Judgment day."
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