Pedestrians should keep to the footpath unless crossing, the council said.
There is no public vehicle access to Marine Parade from Commons Ave, other than for residents and business owners.
Cordoned fencing will be extended from Pilot Bay Beach to the Mount Main Beach.
“It is very important that we preserve the space that recovery agencies need to continue their important work,” the council said in a statement.
“The purpose of the cordon is to manage risk to the public, enable police recovery operations on site and manage public access to ensure security and sensitivity.”