Australian naval drivers suffered minor injuries after a run-in with a Chinese warship. It was revealed that injuries were caused due to sonar pulses.
Richard Marles, Australia's deputy prime minister said the Chinese vessel approached the Australian ship and turned on its sonar.
They're sound emissions used in sonar equipment, bouncing off underwater objects & analysing echoes to map seabed, detect marine life, locate vessels
Exposure to naval sonar, detected as a mid-to-high pitch noise underwater, can lead to discomfort or impacts like dizziness & disorientation.
Marine mammals can suffer hearing damage from noise, just like humans do. This might be temporary, like the ringing of ears or reduced sensitivity.