Published: 08:08, 21 August 2019
| Updated: 10:17, 21 August 2019
Volunteers have been helping police, fire fighters and the coastguard to search for him and are now raising money for his family.
In just two days £1,533 has been raised which will help the search continue across a larger area, according to the JustGiving page.
St Peter's Church in Sandwich and the fire station also have collection buckets to help with the efforts.
KMTV spoke to Chief Insp Mark Weller from Kent Police
A walk along Deal pier was led by some of Lucas' family and his dad, Nathan, thanked everyone for their support at the gathering in Sandwich.
Police are concentrating their efforts on the river and have asked people to stay away but will not stop people from looking.
The family asked people to come to a meeting at the Quay yesterday as they organised a new tactic to keep up the search.
More by this authorAmy Nickalls