Found!Doulichion

The breach

Phorkys, that lies between two points that break the line of the sea and shut the harbour in.

Since we determined that Ithaca (Lefkada) was an island, this barrier (yellow) must have been breached in Odysseus' times, which is exactly what Homer writes here, a break in the line! This is what a scientist tells us about it:

Around 40 m east of the in-situ beachrock ruin of the Plaka, we found a ridge made out of isolated beachrock fragments at 2.5-3.2 m water depth. The rubble ridge is up to 0.9 m thick..... .......The ridge structure is completely separated from the Plaka and its components lie on top of or are partly embedded in sandy deposits. Approaching the Plaka, numerous large beachrock blocks lie in extraordinarily disordered positions completely detached from the in-situ beachrock ruin at 2.9-4.6 m water depth.

It was in all likelihood caused by a tsunami somewhere between 3000 and 2000 BCE, so long before Odysseus and Rhadamantos came along.

The oldest dated tsunami which affected the Lagoon of Aghios Nikolaos and its shores occurred in the
3rd millennium BC.

This means there was a breach, but we still don't know when and how this happened.

Displacement and breach

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Odussey Book 13 line 95-96 Samuel Butler