His mission is to raise awareness and $10,000 to help fund the Kiwis Against Seabed Mining (KASM) High Court appeal against the Environmental Protection Authority decision.
"If we don't stop this operation the door is then open, and it is a new frontier for whoever to make money out of nature, which is simply not on."
Just 14km from the proposed underwater mine site, a community group called Project Reef Life have discovered 88 species of marine life, illustrating the diversity in the area. It is also home to the endangered maui dolphin and blue whale.
"How the heck did this get under the radar?" Steward asked. "We need New Zealanders to be aware of it and then actually stand up and say, 'No this should not and can not go ahead'."
The coastal pilgrimage has been a family affair with Steward's three children helping along the way, and their mum driving the support rig.
"It is pretty nerve racking when you you're sitting around for hours and you know that they are in bush and ocean and the tides are coming in and they have got nowhere to go. I have had a few scary moments," Lari Steward said.
The two week journey ends Sunday when the family arrives home in Whanganui.
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