Protesters in Hong Kong university search for escape route

Anti-government protesters look inside a sewer as they look for an escape route in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. The last band of anti-government protesters trapped...more

Anti-government protesters wait for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Thomas Peter

A riot police officer looks on the sewage system to search for anti-government protesters who escaped from the Hong Kong Polytechnic University (PolyU) after being barricaded by police officers in Hong Kong, China, November 20, 2019. REUTERS/Athit...more

Anti-government protesters wait for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Thomas Peter

A sewer is pictured as anti-government protesters look for an escape route in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

Police officers are seen outside the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Thomas Peter

An anti-government protester waits for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

Anti-government protesters wait for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

An anti-government protester's belongings are pictured as protesters wait for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan...more

Anti-government protesters sleep as they wait for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

A rescue diver enters the sewer to search for anti-government protesters who tried to escape from the besieged Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 19, 2019. REUTERS/Thomas Peter

Anti-government protesters sleep as they wait for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

A protester holds a bow as he keeps an eye out for police movement at the besieged Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

Anti-government protesters sleep as they wait for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

Clothes are scattered by anti-government protesters on the floor of a gym at the besieged Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Thomas Peter

Anti-government protesters wait for an opportunity to escape through a sewer in an underground carpark at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

A rescue diver enters the sewer to search for anti-government protesters who tried to escape from the besieged Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 19, 2019. REUTERS/Thomas Peter

Protesters walk inside the besieged Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi

Trash is scattered near a former frontline at the besieged Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Thomas Peter

Anti-government protesters rest in the gymnasium at the besieged Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Thomas Peter

A rescue diver from the Fire Service department is rinsed after entering the sewage system to search for anti-government protesters who escaped from the Hong Kong Polytechnic University (PolyU) after being barricaded by police officers in Hong Kong,...more

A fire services department officer holds a map of the sewage system as they prepare to search for anti-government protesters who escaped from the Hong Kong Polytechnic University (PolyU) after being barricaded by police officers in Hong Kong, China,...more

The Fire Service department officers prepare before entering the sewage system to search for anti-government protesters who escaped from the Hong Kong Polytechnic University (PolyU) after being barricaded by police officers in Hong Kong, China,...more

Rescue divers from the Fire Service department prepare before entering the sewage system to search for anti-government protesters who escaped from the Hong Kong Polytechnic University (PolyU) after being barricaded by police officers in Hong Kong,...more

A protester looks for an escape route out the besieged Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 20, 2019. REUTERS/Adnan Abidi