LavaPlacer

depth = 0

local function buildInLava()
    if not turtle.detectDown() then
        turtle.down()
        buildInLava()
        turtle.up()
        turtle.placeDown()
        depth = depth + 1
    end
end

local move = require("move")
move.Forward()
buildInLava()
print("Placed "..tostring(depth).." Blocks in Lava")