In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

It may look like a run-of-the mill paddock, but beneath the surface lies a breath-taking phenomenon. Situated 450 km southeast of Adelaide is Mount Gambier, one of the few places in the world with the water conditions and soft limestone bedrock that give rise to spectacular underground sinkholes. Stunning images show specialist divers exploring otherworldly sites such as the 65 metre deep Kilsby’s Sinkhole and the 120 metre deep Shaft, which lie below seemingly mundane farms and paddocks. The caverns are the epicentre of The Cave Divers Association of Australia, who navigate the sites in the name of science. ‘Most people are drawn to the sport for the challenge and exploration, but they become passionate about the scientific elements afterwards,’ said John Vanderleest, the national director of the Cave Divers Association of Australia.Mount Gambier is one of the few cities in the world with the right conditions for underground sinkholesIt features spectacular sites like Kilsby’s Sinkhole and the The Shaft, which are found below paddocksThe caverns are among 30 identified cave sites used by the The Cave Divers Association of AustraliaCave diving involves rigorous training to explore elusive caves using specified gear and equiptment
_ use scuba gear and harnesses to traverse the caverns and unearth marine life and geographic discoveries.

(CNN) Defense attorneys of the accused killer Dylann Roof filed a legal challenge to the U.S. death penalty on Monday night. Roof's attorneys filed the motion stating that they would drop the challenge if prosecutors dropped their pursuit of the death sentence in his case. Roof, 22, is accused of killing nine people at a historic African American church in Charleston, South Carolina, in 2015. Roof, who is white, is charged with 33 federal offenses, including hate crime charges for allegedly targeting his victims on the basis of their race and religion. "The nature of the alleged crime and the resulting harm compelled this decision," Attorney General Loretta Lynch had said in May, regarding the decision to pursue the death penalty.Dylann Roof is accused of killing nine people at a church in 2015His lawyers challenge federal death penalty
_ will withdraw this motion and plead guilty as charged to all counts in the indictment."

An ultramarathoner overcame an early injury, difficult terrain in New England and sleep deprivation on the final stretch of the Appalachian Trail to complete the trek in record time. Scott Jurek, 41, of Colorado reached the summit of Mount Katahdin on July 12 and celebrated his completion of the 2,189-mile run from Georgia to Maine. However, he was handed three citations for violating park rules during the festivities in Baxter State Park. Jurek, who reached Maine's highest summit in 46 days and eight hours, was issued a summons for drinking in the park, hiking with a group larger than 12 people and for littering when champagne sprayed into the air and landed on the ground, the Portland Press Herald reported.Scott Jurek, 41, of Colorado claimed the title of the quickest trek of the Appalachian Trial from Georgia to MaineJurek reached the top of Mount Katahdin in Baxter State Park on July 12While atop the summit, he celebrated his completion of the 2,189-mile runHe was was handed three citations including consuming alcohol in the park and hiking with a group larger than 12 peopleThe park director posted lengthy Facebook message saying Baxter State Park was not 'appropriate place for such an event'

'These “corporate events” have no place in the Park and are incongruous with the _'s mission of resource protection, the appreciation of nature and the respect of the experience of others in the Park,' the post continued.