If you accidentally break the mechanical scarab by using it too many times before you are able to complete the level, there are several possible solutions. If you're playing the PC or Macintosh game, you can download a savegame file in which Lara has the scarab or has already completed this section. Or, use the corner bug to trigger the spikes, making the passageways safe to pass. Do not use the level-skip cheat because you will miss several critical items.
If you aren't familiar with the basic mechanics of the corner bug and crawling corner bug, check out my Useful Bugs page. You'll probably want to practice these moves in a safer location first before attempting them here.
In addition to the screenshots below, check out Czech raider Ewil's YouTube video showing a speed run through this level, which incorporates the corner bug to save time. He doesn't explore the level fully, so he misses the secret, but the video clearly shows how to use the bugs.
IMPORTANT: do not take the RIGHT GAUNTLET before attempting to bypass the second set of spikes using normal jumping corner bug otherwise the spikes won't retract. Instead, you must first activate the second set of spikes using the bug. Then you can safely return for gauntlet and continue further. There is no apparent connection between the gauntlet and the spikes, but for some reason taking it prevents the bug from working. As long as you don't take the gauntlet, you can trigger every set of spikes in the level and explore freely. (Thanks to Ewil himself for this tip. This path is shown in his speedrun video, linked above.)
To get past a set of spikes where the floor near the entrance is flat, use the crawling corner bug, as shown below. (It is also explained in detail on my Useful Bugs page.)
To get past a set of spikes where there is a drop-off near the corner (i.e, the one near the small L-shaped pool) use the basic corner bug, as shown here:
Huge thanks to Ewil and to Richard C., Tomb Raider Tourist webmaster, for alerting me to this particular use of the corner bugs.
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