EVA

We’ve added a new EVA page to this site that lists all of our out-of-Hab activity, with Google Earth visualizations of the track, EveryTrail slideshows of the pictures we took along the way, and Garmin Connect plots of our elevation and heartrate data. Big thanks go to Brian for bringing the GPS logger and heartrate monitor and for having the tech savvy (and devoting the time) to putting all of this information together!

Although today’s snow unfortunately canceled all ATV related EVAs, Luis happily suggested a biology related pedestrian EVA. Brian, Luis and I set out in the early afternoon with nominal EVA gear, headlamps to see each other better in the snow conditions, and Luis’ biology sampling kit. Our destination was Candor Chasma, which is approximately 2.5 km east of the Hab module.

We all eagerly suited up and set out on our journey, but upon opening the airlock door and stepping into the white tundra, we soon realized that sunglasses were a must on this EVA due to the glare off the snow, and unfortunately not all of us were wearing them. Perhaps the shortest EVA in history, our only accomplishment was to knock snow off the satellite receiver and restore Internet access for the Hab. We then sadly returned to the Hab, going through the ingress procedures, and obtained our shades from HabCom. Lesson learned for snow EVAs is to prepare for the glare!

Once again, we were out the hatch in no time bounding through the snow towards the east. Walking in the snow was a bit more challenging in the suits since you cannot determine the depth of the terrain below. It was also slippery and a few of us fell, careful to save the backpack and helmet, sacrificing our lower bodies. Along the journey were several majestic steppes and striated slopes sprinkled in snow. Luis was quick to find two large femur bones (possibly from a cow) during our walk, and also took samples of the fresh snow for biological testing.

We walked at an intense pace and after an hour arrived at Candor Chasma, a mini Grand Canyon filled with multi-colors and striations in the sheer cliff. The view was amazing, however, both Brian’s and my visors were starting to fog, and it began to get exponentially worse. We had all used defogger for the visors, but today’s temperatures were lower than on previous days. We made the decision to turn around and head for the Hab, and the situation became alarmingly worse. I had about 10% visibility out of the lower right part of the helmet, and had to walk with my head to the side to see anything in front. I felt like I was blindfolded and walking to a piñata on the bed of a moving truck. Neither Brian nor I could wipe the fog with our caps since we were both wearing the headlamps for safety. After several efforts to stay in sim, including trying to warm the outside of the helmet with our gloves to get the inside fog to evaporate, we had to opt for safety. After having stumbled half the way back to the Hab, it was necessary for me to break sim and take the helmet off. Once I had vision, I watched out for Brian, who miraculously remained in sim with 0% visibility by the time we were home. We relayed terrain information and directions to him over the radios. In the future, I’d like to do an emergency EVA where this situation would result in us roping ourselves together, walking with one arm on the others’ shoulder, or calling for help from the Hab crew. With two out of the three of us visually impaired, we certainly would have called for help from our fellow crewmembers back at the Hab.

The 2.5 hours of intense exercise was a welcome challenge for the three of us, having been cooped up a bit inside, but the best reward was the hot cocoa awaiting us upon our return.

Today we embarked on some more ambitious EVAs. First we spent a good chunk of time working out how to get the existing database of 500+ GPS waypoints into our GPS units. We had to convert the waypoints from UTM 12 to lat/lon format. Luckily, Brian already had a spreadsheet set up to do this. We then used gpsvisualizer.com to convert an Excel spreadsheet of the results into a .gpx file, which Garmin RoadTrip was able to import. Transferring to my Garmin eTrex Vista HCx worked great, but we couldn’t get RoadTrip to recognize any of the older eTrexes, which use an older cable setup. At any rate, Brian, Darrel, and I decided to head towards “Schiaparelli Huge Fossil Field”, since it was described as featuring both interesting fossils and sedimentary structures (cross-bedding).

After Darrel performed some quick repair on Opportunity’s left front tire, we set out on our ATVs and headed north. The road was in good condition, mostly dry with just a few puddles. We quickly settled into a rhythm; I was in the lead and used a mirror strapped to my left forearm to check on Brian and Darrel behind me about once a minute. We roared up Lowell Highway, slowing to crest hills, ford muddy parts, and rumble over small cuts in the road. We stopped a couple of times to check our GPS location and take pictures. We ended up overshooting our desired turnoff, which was just as well since we realized it would have meant a long trek on foot rather than using the ATVs (these details aren’t always obvious, even with the best of maps!). We turned west onto Brahe “Highway”, which was a sharp change from Lowell; rather than a bulldozed road, Brahe was a single-lane set of tracks that climbed up into the rolling hills, which are called Sheep Knolls. We made it to the Salty Beige Hills before noticing that we must have (again!) passed our desired turnoff onto Schiaparelli Highway, and then attempted 3-point turns to head back without tearing into the land surrounding the track. During this process, Brian’s ATV (Viking-1) died, but after some effort he and Darrel were able to re-start it with the manual pull cord. The views from this area were just stunning, with soaring red cliffs evident to the north and west, including a striking isolated butte.

We retraced our tracks and found the Schiaparelli turnoff, which was even less visible; it clearly had not been used in quite a while, and snow covered it in patches. But we were game to explore further, and so Darrel led the way. Starting up the far side of the first hill, he nearly lost his balance as the ATV leaped up out of the cleft; but he recovered quickly and Brian and I followed, a bit more slowly. We climbed a few hills this way and, fortuitously, ended up in a fossil field (Oyster Field). We climbed off the ATVs and collected some samples. Then, since we’d been out for an hour and a half, we decided to head back the way we came rather than try to follow Schiaparelli further south. Our trip back, naturally, went faster than the trip out—but oh, it was beautiful, with the wind rushing past our helmets, the sun glancing off every shining surface, and the ATVs leaping and bucking beneath us on the road. I got much better at shifting smoothly and enjoyed racing along behind Darrel and Brian, who took turns leading for the trip back.

As soon as we returned, samples in hand, our remaining crew members (Luis, Mike, and Carla) set out for their own spin on the ATVs. This time, they were headed to Clara’s Cliff, far to the west and up on the ridge above us. They set out north, again on a nearly indistinguishable track, towards Olympus Mons. The sun had gotten lower, so it lit up the hills to the east in orange and gold. They struck Sagan Street just before Olympus Mons and entered a series of switchbacks up to Sunday Pointe. They slowed to take the turns carefully, and kept to the existing ruts to avoid the sides of the switchbacks, maintaining healthy following distances and stopping periodically to check that everyone was following. As they crested the ridge, they glanced back to the north and down to the hills and ridges and were struck by the contrast between the colored hills and blue, blue sky. They continued on, sloping down a little onto Mid-Ridge Planitia. The Planitia spread out before them in a vast expanse dotted with only occasional small shrubs, like pills on a worn sweater. After some time, they realized that they would not be able to travel all the way to Clara’s Cliff and still return to the Hab before the sun went down, so they halted near intersection with Schiaparelli Highway, where Luis collected a sample of snow and another of soil. Here the Spirit ATV gave them some trouble starting, but after some rocking and encouragement, they were able to head back to the Hab.

Dinner was an interesting melange originally intended as a tofu stirfry, but ultimately more of a melange of tofu and reconstituted vegetables, plus a concoction intended to mimic a stirfry sauce (and approximately succeeding!).