Edmond de Rothschild got swept along on a wave and then ploughed into the bottom, coming to a sudden stop.
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Monday morning, Josse was sailing on starboard gybe in a westerly air stream blowing at between 30 and 35 knots and on heavy seas with waves in excess of 4m.
The 60-foot monohull got swept along on a wave and then ploughed into the bottom of the wave.
The boat came to a sudden standstill and in the incident the port foil suddenly went right down.
It slammed into the top of the housing, which damaged the upper part of the appendage and its trimming system.
Sébastien Josse was inside when the incident occurred and was not injured.
In order to make safe the foil, which threatened to come out of its housing, Josse gybed to change tack and continue on his starboard foil while trying to carry out temporary repairs
Josse had been trying to avoid the centre of the extreme low pressure system by making headway towards the east as quickly as possible along the Antarctic Exclusion Zone.
Since 13:00 UTC the 60-foot monohullEdmond de Rothschild has gone back to a SE'ly heading, seeking lighter winds as he looks to find a solution to his damage.
In another incident, Romain Attanasio, skipper of the Famille Mary - Etamine du Lys boat hit a UFO at around 11:30 UTC today (Monday).
Romain was around 470 miles south of Cape Town (South Africa) when his boat, Famille Mary - Etamine du Lys collided with the UFO, which has damaged both his rudders.
He has taken the decision to head for Cape Town to attempt to carry out repairs without any external help.
Armel Le Cléac’h smashed the race reference for the passage from Les Sables d’Olonne to Cape Leeuwin early Monday morning.
He broke the mark set by François Gabart in December 2012 by an incredible five days 14 hours and 26 minutes.
LEADING POSITIONS at 12:00 hrs UTC Tuesday:
1. Armel Le Cléac’h on Banque Populaire VIII - DTG 13,077 nm - sailing at 18 knots
2. Alex Thomson on Hugo Boss - DTL 100 nm - sailing at 16 knots
3. Sebastien Josse on Edmond de Rothchild - DTL 770 nm - sailing at 14 knots
4. Paul Meilhat on SMA - DTL 1213 nm
5. Jeremie Beyou on Maitre Coq - DTL 1474 nm
6. Yann Elies on Quigunnier - DTL 1670 nm
7. Jean-Pierre Dick on StMichel-Virbac - DTL 1840 nm
8. Jean Le Cam on Finistere Mer Vent - DTL 2129 nm
9. Thomas Ruyant on Le Souffle du Nord - DTL 2329 nm
Fleet spread is now 5,651 nm back to Didac Costa in 24th.
Fiver have now retired from the race.
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5 December 2016 15:30 GMT