An ARP trainee follows orders given by a trainer while climbing the "road to heaven", at Zuoying navy base, Kaohsiung, southern Taiwan, December 22, 2021. The "road to heaven", is the final obstacle course consisting of a stretch of rocks some 100 metres long over which the trainees have to scramble on their bellies and complete tasks like push ups to the satisfaction of their trainers. REUTERS/Ann Wang

ARP trainees create a "sand storm" as the morning training concludes during the last week of a ten week program to become members of the Taiwan navy's elite Amphibious Reconnaissance and Patrol unit, at Zuoying navy base, Kaohsiung, southern Taiwan, December 18, 2021. They're driven to train up for the unit out of patriotism and a desire to push their personal limits. REUTERS/Ann Wang

ARP trainees battle the waves while completing training exercises during the last week of a ten week program to become members of the Taiwan navy's elite Amphibious Reconnaissance and Patrol unit, at Zuoying navy base, Kaohsiung, southern Taiwan, December 18, 2021. The trainees have to endure everything from long marches to hours in the water, with constant screaming at by their instructors. Of the group of 31 who started the program, only 15 finished. REUTERS/Ann Wang

ARP trainees try to stay above water for hours at a time as part of their training to become members of the Taiwan navy's elite Amphibious Reconnaissance and Patrol unit, at Zuoying navy base, Kaohsiung, southern Taiwan, December 20, 2021. Should a war break out, Taiwan's frogmen could be spirited across the strait in the middle of the night to scout enemy locations and call in attacks. REUTERS/Ann Wang

An ARP trainee dressed in camouflage wades through sewage contaminated water during the last week of a ten week intensive program to become a member of the Taiwan navy's elite Amphibious Reconnaissance and Patrol unit, at Zuoying navy base, Kaohsiung, southern Taiwan, December 21, 2021. REUTERS/Ann Wang

An ARP trainee pulls a fellow trainee, who is pretending to be injured, through sewage contaminated water during the last week of a ten week program to become members of the Taiwan navy's elite Amphibious Reconnaissance and Patrol unit, at Zuoying navy base, Kaohsiung, southern Taiwan, December 21, 2021. REUTERS/Ann Wang