It's not even tunnel or climbing makes this ridicules, there was report about immigrants (from Mexico) coming to USA and majority were coming with plains or coming with legal ground and overstaying. So in practice wall would be expensive to build, expensive to maintain and would achieve nothing practical. But there's catch, trump supporters don't want anything practical, if big yellow men tells that all their problems is because of missing wall, they will accept that.
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It's not even tunnel or climbing makes this ridicules, there was report about immigrants (from Mexico) coming to USA and majority were coming with plains or coming with legal ground and overstaying. So in practice wall would be expensive to build, expensive to maintain and would achieve nothing practical. But there's catch, trump supporters don't want anything practical, if big yellow men tells that all their problems is because of missing wall, they will accept that.