South Korea attempts to rescue viral sensation shark in Busan canal

• South Korean authorities began a new attempt to guide a shark back to sea.
• The shark, a 9ft 10in (3m) viral sensation, is stranded in the Busan canal.
• Falling temperatures in the canal have raised concerns for the shark's survival.
• This is the third attempt to guide the shark back to the open sea.
• Huge crowds have gathered to watch the rescue attempt.