Find a buiried cable digging a trench

Problem nummber 110 from http://mathproblems.info/group6.html

There is a straight cable buried under a unit square field. You must dig one or more ditches to locate the buried cable. Where should you dig to guarantee finding the cable and to minimize digging? For example you could dig an X shape for total ditch length of 2*sqr(2) but there is a better answer.

Solution….

Finding a solution  - page one

Finding a solution - page one

continuing…

Finding a solution  - page two

Finding a solution - page two

continuing…

Finding a solution  - page three

Finding a solution - page three

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