Hell, they did that on a regular basis during WWII clearing Italian and French ports.
Anyone hear the adage of all eggs in one basket.
On drilling rigs we could lift in excess of 500,000 pounds out of the hole. Send divers down to cut the sunken parts in the channel into pieces. Demolition charges will cut it in pieces. Attach the same things we used in the oil and drag it out of the channel. This could be done in weeks. The harbor is now functional and rebuild the bridge at your leisure.
Actually we have done 2 million pounds of casing but this was floated into the hole.
HOUSTON, December 16, 2015 – Weatherford achieved a new world record by landing a 1,180-ton (2,360,700-lb) casing string at a total depth of 26,805 ft (8,170 m). The job was performed on a deepwater rig in the Gulf of Mexico this fall.
The operator of a deepwater rig in the Green Canyon required installation of a heavy, 14-in., 112.6 lb/ft casing string. The total weight of the casing and landing string needed to reach total depth was 1,180 tons. The operator contracted with Weatherford to install the landing-string slips 1250 (”LSS 1250”), which acts as a spider to safely and efficiently grip tubulars and has a maximum load capacity of 1,250 tons (2,500,000 lb).
“Hell, they did that on a regular basis during WWII clearing Italian and French ports.”
Hard to see how a DEI could clear the passage, even given a year.