Kansas City, Kan. ? A Kansas lawmaker whose 10-year-old son was killed on the world’s tallest waterslide thanked supporters Tuesday, joining two others who were in the ill-fated raft in hoping that unfolding investigations prevent any such tragedy from happening again.

Scott Schwab, in a statement released by the family’s lawyer, said “words will never convey the appreciation” the Schwabs have for the public outpouring since Caleb Schwab died Aug. 7 on the 168-foot tall “Verrückt” ride at the Schlitterbahn Waterpark in Kansas City, Kan.

“‘Thank You’ seems so inadequate to express our appreciation, but it is the only phrase we have. So, from the depths of our hearts, we thank you,” Schwab, a Republican from Olathe, said in the statement, first reported by the Kansas City Star.

This June 2016 photo provided by David Strickland shows Caleb Thomas Schwab posing with his father Scott Schwab, a Kansas state lawmaker from Olathe. Caleb died Sunday, Aug. 7, 2016, while riding the Verruckt, a water slide that's billed as the world's largest, at the Schlitterbahn Waterpark in Kansas City, Kan.

“While we try to step forward into the new normal of life without Caleb in our presence, we find hope with the current investigation into the incident to provide answers and assurances that such tragedy will not strike again.”

Michael Rader, a partner in the law firm hired by the Schwabs, said Schlitterbahn has cooperated with his independent investigation of the tragedy that also injured the raft’s two other occupants — Hannah Barnes, 32, and Matraca Baetz, 25.

“I can say that my firm and I along with our team of experts are doing everything in our power to ensure that all questions surrounding the cause of this tragedy are fully answered,” Rader wrote.

Cameron Morgan, a police spokesman, said earlier Tuesday that it’s unclear when the investigation will be completed and any findings released.

Barnes and Baetz issued a separate statement through their attorney, Lynn Johnson, partner with Kansas City law firm Shamberg, Johnson & Bergman.

“Being mothers ourselves, we can only hope that Caleb’s family can find some comfort in knowing we are doing everything we know how to do to stop something so tragic from occurring again to any other family,” the women’s statement said.

Johnson told The Associated Press that Barnes and Baetz “want answers and assurances from Schlitterbahn that that slide will be corrected or not continue to be in operation.”

This November 2013 file photo shows Schlitterbahn’s Verruckt speed slide/water coaster in Kansas City, Kan.

“If necessary, there will be litigation,” he said, adding that “we have not had the opportunity to have our experts inspect the Verrückt or see the (ride’s design) drawings.”

When it comes to discussing what caused the tragedy, “we would be hesitant to say anything until our experts inform us of their opinions,” Johnson said.

Caleb Schwab was decapitated in the accident, a person familiar with the investigation told the AP last week on condition of anonymity because that person was not authorized to speak publicly about the boy’s death.

Verrückt — German for “insane” — features multi-person rafts that make a 168-foot drop at speeds of up to 70 mph, followed by a surge up a hump and a 50-foot descent to a finishing pool.

Riders, who must be at least 54 inches tall, are harnessed with two nylon seat belt-like straps — one that crosses the rider’s lap, the other stretching diagonally like a car shoulder seat belt. Each strap is held in place by long straps that close with fabric fasteners, not buckles. Riders hold ropes inside the raft.

Riders are weighed to ensure each raft carries between 400 pounds and 550 pounds.

Police on Monday released a report showing one rider at 140 pounds, another at 170, and an unclear weight for Caleb, who would have had to weigh 90 pounds to make the trio’s weight reach 400 pounds. But police said weights taken at a hospital after the accident show one person weighed 275 pounds, another 197 pounds and a third 73 pounds, putting the combined weight at 545 pounds.