To Create a Mesh from Points Using Tunnel

Select the Mesh from Points tool ( Modeling > Mesh > Create ).
Set Direction to Tunnel.
Note: Winding tunnels cannot be created using this tool.
Select the necessary elements with a selection set. <Ctrl + click> to select additional elements.
The center of the mass of elements will be used to position the start of the tunnel axis, which is the center of the triangulation cylinder.
Define the direction of the cylinder.
The mesh is created from the selected elements.

Mesh from Points with Direction set to Tunnel