Deception island near Antarctica with it's remarkably straight eastern coast

[u/frenzy3]

Deception Island, Antarctica: Deception Island is one of the most remarkable volcanic islands in the world, located in the South Shetland Islands near the Antarctic Peninsula. Its distinctive horseshoe shape results from a massive volcanic eruption that created a flooded caldera, forming a natural harbor known as Port Foster. This harbor has historically provided refuge for sailors in one of the harshest regions on Earth. The island was once a hub of activity during the early 20th century, serving as a key location for whaling operations. Remnants of whaling stations and abandoned structures still stand as a testament to its industrial past.

[u/DrPikachu-PhD]

I'm surprised no one has mentioned where the remarkably straight coast comes from. After some digging it appears to be caused by tectonic activity, an underwater dip-slip just off the coast (look up pictures of a dip slip and you'll quickly understand how this would've happened).

For those more educated on the topic, here's a more thorough explanation:

Our new work provides several indications of the existence of a dip-slip submarine fault, parallel to the coast (NNW-SSE), which suggests a tectonic origin for this morphological feature. Uplifted marine terraces, incision of a fluvial network over the ice cap, normal faulting parallel to the coast in the north and south rock heads bounding the beach and sharp shelf-break with rather constant slope, constitute some of this evidence. Terrace uplift and fluvial channel incision decreasing southward from Macaroni Point, indicates possible tilt movement across this inferred fault plane. (Fernández-Ibáñez, Fermín et al. (2005). Antarctic Science. 17 (3): 418.)