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SpaceX’s second Super Heavy booster enters production in South Texas
In a rare burst of visible activity, SpaceX’s South Texas Starship factory has begun fabricating a second Super Heavy booster and taken a significant step forward on the first prototype.
Set to be the largest operational rocket stage ever built by more than a factor of two, Super Heavy is the booster tasked with launching a fully fueled and loaded Starship (~1400 mT or 3 million lbs) out of the bulk of Earth’s atmosphere. Powered by up to 28 Raptor engines, Super Heavy and Starship will weigh upwards of 5000 metric tons (~11 million lbs) and produce anywhere from 5600 to 7700 metric tons (12.5-17 million lbf) of thrust at liftoff.
Most importantly, though SpaceX CEO Elon Musk has noted that an optimized Starship might be able to reach orbit on a one-way trip, a giant, reasonably efficient booster like Super Heavy is necessary to send Starship into a healthy orbit with all the extra hardware and mass needed to make the orbital spaceship reusable. More than twice as heavy and two-thirds as tall as SpaceX’s workhorse Falcon 9 rocket, that will be no small feat.
Following the appearance of Super Heavy booster number 1’s (BN1) unique common dome, extra-large ‘transfer tube’ segments, and a donut-like eight-Raptor thrust section last month, visible booster work settled down for the next several weeks. In the interim, Musk revealed that SpaceX aims to hop the first Super Heavy booster (BN1) just “a few months” into 2021, followed by the bombshell that the CEO wants to eventually catch Super Heavy boosters to avoid the need for landing legs entirely.
Two weeks after that latest info from Musk and a month after major booster-related factory activity, the first hardware intended for Super Heavy prototype BN2 was spotted on January 19th. Featuring a never-before-seen structural addition in the form of what looks like a hexagonal or octagonal steel ring, the booster’s unique forward dome represents the first real evidence of the modifications needed to install a variety of hardware specific to Super Heavy.
The limited nature and number of current views make it hard to conclude with certainty that the BN2 forward dome’s add-on is hexagonal or octagonal – either could technically be made to work. Barring a surprise design change, Super Heavy – like Falcon 9 and Heavy boosters – will sport four equally spaced grid fins and use them to ensure aerodynamic stability and control authority from hypersonic to supersonic velocities. Based on official SpaceX graphics, Super Heavy’s grid fins will be built out of welded steel, measure some 7 meters (23 ft) tall, and likely weigh 5+ metric tons apiece, thus requiring extremely powerful actuation systems and strong structural support.
Meanwhile, beyond Super Heavy BN2’s first visible appearance, the process of assembling the first booster prototype also took a significant step forward. Sometime on January 19th, SpaceX ended a long period of inactivity, stacking the first Super Heavy ring sections since November 2020. More specifically, SpaceX teams appear to have installed either one or two four-ring sections on an existing booster segment already inside the high bay.
If at rest on top of the rest of the stack in Mary’s (BocaChicaGal) latest photo, one of two Super Heavy ‘stacks’ inside the high bay is now 12 rings (three sections) tall, representing almost a third of a complete 70-meter (~230 ft) tall booster. As of the most recent look inside the high bay, there were two separate stacks of Super Heavy rings – one with four and the other with eight. Based on the location of the new 12-ring stack, it’s more likely than not that SpaceX has simply combined the 12 rings last seen inside the high bay rather than adding one or two new ring sections to one of the two separate stacks.
Ultimately, the return of Super Heavy stacking activity after a two-month pause is an encouraging sign that SpaceX has settled on a design for the first few prototype boosters and could, in fact, be ready to start testing BN1 “a few months” from now.
A Tesla Semi caught fire in Hayward, California, which caused both directions of traffic to shut down for hours before being completely reopened early on Wednesday, the California Highway Patrol said.
The fire occurred just after 5:30 local time in Hayward on Tuesday, as the Semi caught fire in the southbound lanes of I-880 before CHP officials made the decision to shut down both lanes of traffic due to potential risks from hazardous chemical smoke.
There were no injuries reported.
🚨 A Tesla Semi reportedly caught fire, with California Highway Patrol confirming. The Semi was on I-880 SB
An estimated 5,000 to 7,000 semi-truck and large commercial vehicle fires occur on U.S. roadways every year
— TESLARATI (@Teslarati) October 28, 2026
The cause of the fire is currently unknown, as neither Tesla nor the CHP have not determined a cause.
However, some images taken before the Semi was completely destroyed by the fire seem to indicate this might have been an older unit, as it appears to be one of the designs that Tesla shipped as part of its pilot program, before revising it and starting mass production just a month ago.
@Tslachan From on of the videos looks like it’s an old Semi (not the refresh version that recently started production) https://t.co/KzwmR2kXow
— Area Under The Curve 🎗️ (@AreaUnderCurve) October 28, 2026
At the time of publication, CHP had not returned our request for a comment for additional details, including the Semi involved and any potential collaboration on an investigation between the CHP and Tesla. We will update this story when we hear back from them.
The southbound lanes were reopened at 3:30 a.m. on Wednesday, with the northbound lanes opening last night a few hours after the fire began. The CHP did state that the lithium batteries were “incredibly difficult to extinguish,” according to NBC Bay Area.
The truck’s driver said that the Semi caught fire, but he did not have an explanation.
An estimated 5,000 to 7,000 semi-truck and large commercial vehicle fires occur on U.S. roadways every year.
Tesla’s launch of the “Emergency Drive Away” function a few months back offered owners a safe option to evacuate an area if they were in reasonable danger. The function finally got its first use in the real world, but it appears it was by mistake.
A video shared by u/Joshalander in the r/TeslaLounge subreddit recorded the instance from his vehicle and said the incident took place in Austin this past weekend during the city’s F1 Race.
“Was charging around 6 AM this past Sunday in Austin before heading to the F1 race and heard a pop. Looked over and saw the new emergency drive-away feature in action. Genuinely felt bad for the dude when he got out and realized what happened, since he looked exhausted and only seemed to half-read the prompts.”
🚨 Here’s the first look at Tesla’s Emergency Drive Away function in action:
Apparently this driver accidentally enabled it and drove forward; you can see the Supercharger pull with the car.
Tesla said previously this would cost up to $25k if not used properly. https://t.co/B4qQRrsO6B
— TESLARATI (@Teslarati) October 28, 2026
Emergency Drive Away unlatches the Supercharger connector from the vehicle, but still causes damage to both the car and the Supercharger. Tesla has said that it will cost up to $25,000 in repairs to have everything fixed back to normal.
Additionally, the company said that if it were not used in an emergency situation, the driver of the vehicle who activated the Emergency Drive Away feature would be responsible for all repair costs.
Tesla constitutes the following situations as reasonable justifications for activating the feature:
- You face an immediate threat to your life or personal safety.
- You must leave the area immediately.
- Exiting the vehicle is unsafe.
- Unplugging the charge connector would unreasonably delay your departure or expose you to a risk to your personal safety.
After using the feature, Tesla requires the driver to schedule Service so the car can be inspected.
News
Tesla’s Cybercab battery design could make robotaxis even cheaper
Tesla built the Cybercab’s battery pack with spare room for a future switch to LFP.
Tesla built the Cybercab’s battery pack with empty space inside it on purpose, and the reason points to a cheaper robotaxi down the road.
Robert Sumpf, Tesla’s director of mechanical design engineering for battery modules and packs, said the extra room beside and beneath the Cybercab’s modules was left there so the company can move to lithium iron phosphate cells later. “So, we protected this pack to go to an even lower energy dense chemistry as we scale and need to bring LFP into the platform,” Sumpf said in a Cybercab deep dive with Munro Live.
The Cybercab runs on Tesla’s own 4680 cells with a nickel chemistry today. LFP cells store less energy for their size, so a straight swap would cut range. The reserved space lets Tesla add more LFP cells to make up the difference. In return, Tesla would get cells that cost less, run cooler and survive more charge cycles. LFP became the most used EV battery chemistry in the world last year.
Not all of that room was planned for a chemistry change. Lars Moravy, Tesla’s Vice President of Vehicle Engineering, said part of it exists because “we didn’t need as many batteries as we thought we did.” Tesla told Sandy Munro in early 2025 that it was targeting a Cybercab pack under 50 kWh with close to 300 miles of range.
The pack also breaks from the structural design Tesla used in some Model Y and Cybertruck builds. Instead of potting hundreds of cells into one block, the Cybercab uses four separate, individually sealed modules, so a bad module can be replaced without scrapping the whole pack. Sumpf was blunt about the older approach, giving the Model Y structural battery “a grade D” because it was hard to build and nearly impossible to repair. He estimated a fully structural pack gains about 10% more cell volume, but said “the issue is the service cost.”
That cost matters more for a car that rarely sits parked. Cybercab chief engineer Eric Earley said replacing an entire pack “before half a million miles is a killer on cost,” which is why remanufacturing and serviceability were built into the design from the start.
The same Munro Live tour produced Moravy’s admission that the Cybercab line at Giga Texas is now outpacing Robotaxi deployments, along with a look at the robotaxi’s unorthodox paint process. Tesla is aiming to deliver the first Cybercabs to outside customers by the end of 2026, though Elon Musk has said the vast majority will stay owned by Tesla and run as a transport service.
Sumpf did not give a date for an LFP version, name a cell supplier or say how a chemistry change would affect range. For now, the 4680 cars keep piling up: Texas DMV records from Tuesday list 544 Cybercabs authorized for Tesla’s Robotaxi fleet, more than the 507 Model Ys on the same roster for the first time.
Tesla Semi catches fire in California: what we know
Tesla’s ‘Emergency Drive Away’ function gets its first use in the real world
