Australian Explorers Set New Record for Deepest Cave

The cave site of Panga ya Saidi, in Kenya's Kilifi County is
seen in this undated photograph.  Mohammad Javad Shoaee/Handout via
REUTERS
The cave site of Panga ya Saidi, in Kenya's Kilifi County is seen in this undated photograph. Mohammad Javad Shoaee/Handout via REUTERS
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Australian Explorers Set New Record for Deepest Cave

The cave site of Panga ya Saidi, in Kenya's Kilifi County is
seen in this undated photograph.  Mohammad Javad Shoaee/Handout via
REUTERS
The cave site of Panga ya Saidi, in Kenya's Kilifi County is seen in this undated photograph. Mohammad Javad Shoaee/Handout via REUTERS

A team of Australian cave explorers descended in a 400-meter-deep cave chain in Tasmania region, bringing a new record to their country, according to the German News Agency.

“The team successfully connected a newly discovered cave, named ‘Delta Variant,’ to the Niggly/Growling Swallet Cave system, taking the record for Australia’s deepest known cave to an anticipated 401 vertical meters. The team entered Delta Variant right before noon, on Saturday.

After first negotiating a difficult horizontal section, they descended down the ropes that had been fixed over the last six months.

When they reached the end of the last rope they tied, they descended another 35m, and reached the bottom of Delta Variant, breaking through into the Niggly System.

The team then exited via the Niggly System to achieve the first system traverse using this entrance,” Southern Tasmanian Caverneers said in a statement.

The team faced very challenging conditions with high water levels and spent over 14 hours underground.

“Making the connection between Delta Variant and Niggly is a momentous achievement for the caving community, but also adds to our scientific understanding of the extensiveness of Australia’s karst systems,” said team member Ciara Smart.



Croatia's Scientists Seek to Ward Off Threat to Posidonia Seagrass

Salema porgy swim near seagrass in the protected area of France's Porquerolles National Park ahead of the UN Ocean Conference on Friday, June 6, 2025. (AP Photo/Annika Hammerschlag)
Salema porgy swim near seagrass in the protected area of France's Porquerolles National Park ahead of the UN Ocean Conference on Friday, June 6, 2025. (AP Photo/Annika Hammerschlag)
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Croatia's Scientists Seek to Ward Off Threat to Posidonia Seagrass

Salema porgy swim near seagrass in the protected area of France's Porquerolles National Park ahead of the UN Ocean Conference on Friday, June 6, 2025. (AP Photo/Annika Hammerschlag)
Salema porgy swim near seagrass in the protected area of France's Porquerolles National Park ahead of the UN Ocean Conference on Friday, June 6, 2025. (AP Photo/Annika Hammerschlag)

At Croatia’s Dugi Otok island in the Adriatic Sea, scientists, demanding action to protect environmentally important meadows of seagrass, have been on a diving mission to assess the damage inflicted by human activity.

Named after Poseidon, the ancient Greek god of the sea, Posidonia oceanica, commonly known as Mediterranean tapeweed, provides food and shelter for fish, protects coasts from erosion, purifies sea water and can play a vital role in helping to tackle global warming.

A meadow of Posidonia can annually soak up to 15 times more carbon dioxide than a similar sized piece of the Amazon rainforest, scientific research has found.

But the scientists say much more needs to be done to protect it from tourist anchoring and from trawlers dragging fishing nets in the waters of the Adriatic Sea off Dugi Otok and the surrounding Kornati archipelago national park.

They have urged tougher regulations and fines for anyone breaching them.

Dominik Mihaljevic, a biologist at the national park, said the park had begun to install anchorages that would not harm the seagrass.

"Our ultimate goal is to completely prohibit anchoring at the 19 anchorage locations that are currently in use," Reuters quoted him as saying.

Matea Spika, a senior associate at Croatia’s Sunce environmental protection association, told Reuters Mediterranean Posidonia, endemic to the Mediterranean Sea, had declined by 30% in the last 30-to-40 years.

Apart from the issue of anchors and fishing nets, she said chemicals, excess nutrients from farms and cities, warmer waters due to climate change, and invasive species had caused further damage.

New ports and artificial beaches have also blocked sunlight essential for Posidonia’s growth.