EIN GEDI, Israel -- A multinational group of swimmers swam seven hours through the salty, soupy waters of the Dead Sea on Tuesday in a bid to draw attention to the environmental degradation of the fabled lake.At dawn, the 25 swimmers left on boats from Ein Gedi on the Israeli side of the Dead Sea to Wadi Mujib on the Jordanian side. Then, wearing special protective masks and snorkels, the swimmers paddled through the thick waters in what turned into a 17-kilometer (11-mile) swim from Jordan to Israel.Swimming in the Dead Sea is unusual.Tourists typically dip themselves from the beaches and float on the water with the help of the lakes high salt concentration. It also draws people from around the world who believe the waters high mineral content is beneficial for skin conditions.The Dead Sea, the lowest place on earth at 423 meters (1,388 feet) below sea level, has shrunk significantly over recent decades, a process environmentalists blame on unsustainable water management and over-exploitation of the lakes minerals.Were here for the first ever Dead Sea swim challenge with 25 swimmers that come from all over the world to send out a clear message to save the Dead Sea, which is shrinking today at an alarming rate, said Mira Edelstein, from the environmental group EcoPeace, one of the swims organizers.Organizers say the Dead Seas water level has fallen more than 25 meters (80 feet) over the last three decades. The lakes southern basin, disconnected from the shrinking northern side, has seen flooding in recent years because of heavy industrialization.The swimmers, who hailed from Israel, the Palestinian territories and as far as New Zealand, South Africa and Denmark, wore special face masks to shield them from the briny water, which is painful to the eyes and can be deadly to ingest. The group was accompanied by support vessels with medical equipment and food.Despite the tough conditions, only three swimmers failed to finish -- two who suffered from dehydration and a third who complained of chills.Four swimmers took breaks on the medical vessel. Palestinian lifeguard Yussuf Matari, 61, was treated with an IV as he rested in the shade of a boats tarp before plunging in to the waters again.Jackie Cobell, a British long-distance swimmer, called the Dead Sea swim historic and iconic, before descending into the water. This is really important because its disappearing fast.Those who neared the shoreline first waited so all could finish the race together. Speakers blared We are the Champions, the iconic hit by the English rock band Queen.I must say that I did not expect this swim to be so hard and what was really, really tough conditions is that salt. Constantly trying to get the salt out of your mask and the chafing, said Jean Craven, a founder of Madswimmer, a South African charity that participates in open water swims around the world to raise money for childrens causes.This was a challenge, not a race, he added. It was really great to see the camaraderie, you know, everyone trying to bring the slowest swimmers along with them. Red Grange Jersey . Perez, 35, posted a 1-2 record with a 3.69 earned-run average in 19 relief appearances last season. His season ended Aug. 9 due to a torn ligament in his left elbow. 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Changes could still be made as a result of a suspension or injury.SANTA CLARA, Calif. -- As devastated as Ian Williams felt two years ago when he went undrafted out of Notre Dame, he can now look back on that moment and realize how much the rejection meant to his career. He landed with the San Francisco 49ers, and is the leading candidate to win the starting nose tackle job for the NFC champions as he begins his third NFL season. "It hurt, but looking back at it, it was probably the best situation that could have ever happened," Williams said after a recent practice. "I was a young kid, expecting this, expecting that. It kind of put me back to my place, and coming here and getting back to work really propelled me to where I am now. "I lost sight of the goal that I set. Drastic things usually get you back on track." The expectations for Williams are high heading into the teams exhibition opener Thursday night at home in Candlestick Park against Peyton Manning and the Denver Broncos. San Francisco lost both its starter and backup at the position to free agency this spring, leaving Williams and veteran newcomer lineman Glenn Dorsey to push each other in training camp -- yet Williams has more experience. Dorsey could spend some time at defensive end, too. Williams prepared himself for this opportunity by losing 25 pounds from his previous playing weight during the off-season, bringing him down to 305 and right where he hopes to stay this season. Defensive co-ordinator Vic Fangio has noticed an improvement in Williams agility and quick step off the snap. "I can feel a great difference. We havent been in a game yet, but just being out in practice and working out here just really got me ready and going against our O-line the past two years has really gotten me ready for what I have in front of me," Williams said. "Toward the end of the season it gets cold out here and its hard to sweat and youre still eating two or three times a day, so its hard to lose weight. Then the off-season came and I worked hard, I stayed here." To this day, Fangio cant point to exactly why Williams wasnt drafted. Perhaps his 6-foot-1 height caused NFL teams to shy away. "Every year you see that happen. Why wasnt he drafted at least in the seventh round the year he came out? I dont know," Fangio said. "I dont know if there were some questions about his work habits. Obviously, hes on the short side as most D-linemenn go.dddddddddddd. I dont have a good answer for you there. Trust me, he should have been drafted." Williams, with shoulder-length braids, has played in four games total. That hasnt kept the 49ers from believing he is ready to take on a starting role. And Williams always stayed upbeat as he paid his dues buried on the depth chart and regularly inactive for game days during his first two seasons. "It was vital to where I am right now," he said. "Just coming into a good situation and having a veteran crew around me and guys who really took me under their wing and taught me even though I was coming in to compete at the position, I really came into a great situation." In March, that situation became even better when Williams received a two-year contract extension carrying him through the 2015 season. That vote of confidence meant a lot to Williams, who has seven career tackles as he approaches his 24th birthday later this month. "I really wasnt worried about getting paid for the contact. It just showed me that I had to get back to work and work even harder," he said. "Tasting the Super Bowl and getting that close to a ring, to a victory, that got me hungry. The contract extension got me even hungrier. Im not even worried about all that. Im just trying to come back, compete, work and try to get back to another Super Bowl." Williams keeps in touch with both Isaac Sopoaga, now with the Eagles, and Colts defensive lineman Jean Francois. He tries to learn from Justin Smith and Ray McDonald each day. He also appreciates regular feedback from linebackers Patrick Willis and NaVorro Bowman. "Its really his knack for being able to move. A lot of times people think nose guards are guys that are just big and just hold a point," Willis said. "But hes a guy that if you single him he can beat you 1-on-1. If you double-team he can hold the point. As a middle linebacker, thats what you love to see." Notes: The 49ers signed P Colton Schmidt to a three-year deal and waived WR Charly Martin. ... In Thursdays game, Demarcus Dobbs is slated to start in place of Justin Smith as the All-Pro Smith nurses an injured finger. Fangio also said Craig Dahl, the former Rams S signed to a three-year contract in March to help fill the void of Dashon Goldsons departure, will start at free safety and rookie Eric Reid will enter later. 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