His family say it's possible he has found enough food and water and could be hiding in the bush somewhere waiting to be found.
The efforts of the search teams will be boosted with help from generous Murupara helicopter business Heli Resources today.
If any residents still haven't checked their properties, they should do it now.
There hasn't been such a large-scale ground search since 2006 when 84-year-old partially blind woman Mabel Jamieson went missing from her home.
Residents joined the city-wide search for the dementia sufferer and sadly her body was found six days later not far from her home between a garage and a fence.
For the family of Lines, their hopes of finding the 24-year-old alive following last week's fishing tragedy have faded with police calling off their search on Friday.
But until he is found, they will no doubt always cling to a miracle he somehow managed to survive.
It's heartbreaking for Rotorua loved ones to be going through such ordeals so close to Christmas and our thoughts are with them.
In the meantime we wait for what we hope will be much needed good news for both families.