{"version":"1.0","provider_name":"Autonotion","provider_url":"https:\/\/www.autonocion.com\/us","author_name":"Chema Bonilla D\u00edaz","author_url":"https:\/\/www.autonocion.com\/us\/author\/chemabonilla\/","title":"A shield of 12 cast-iron frames, nearly 8 tons apiece, held 36 men one to a cell as they dug the first tunnel under the Thames, 75 feet below high tide, each man screwing his cell forward off the finished brickwork \u2014 and every tunnel boring machine on Earth still runs on that idea","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"N9G3Zgq5Ru\"><a href=\"https:\/\/www.autonocion.com\/us\/12-iron-frames-shield-thames\/\">A shield of 12 cast-iron frames, nearly 8 tons apiece, held 36 men one to a cell as they dug the first tunnel under the Thames, 75 feet below high tide, each man screwing his cell forward off the finished brickwork \u2014 and every tunnel boring machine on Earth still runs on that idea<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.autonocion.com\/us\/12-iron-frames-shield-thames\/embed\/#?secret=N9G3Zgq5Ru\" width=\"600\" height=\"338\" title=\"&#8220;A shield of 12 cast-iron frames, nearly 8 tons apiece, held 36 men one to a cell as they dug the first tunnel under the Thames, 75 feet below high tide, each man screwing his cell forward off the finished brickwork \u2014 and every tunnel boring machine on Earth still runs on that idea&#8221; &#8212; Autonotion\" data-secret=\"N9G3Zgq5Ru\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/www.autonocion.com\/us\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/www.autonocion.com\/us\/wp-content\/uploads\/2026\/07\/HS2-TBM-Karen-launch-Old-Oak-Common-768x432.jpg","thumbnail_width":600,"thumbnail_height":338}